chore: Update discovery artifacts (#1438)

## Deleted keys were detected in the following stable discovery artifacts:
youtube v3 https://github.com/googleapis/google-api-python-client/commit/ec21dff96d9538ad6c7f9b318eca88178533aa95

## Deleted keys were detected in the following pre-stable discovery artifacts:
firebasehosting v1beta1 https://github.com/googleapis/google-api-python-client/commit/c83ac386b65f82e7ba29851d56b496b09a29cf98

## Discovery Artifact Change Summary:
feat(analyticsadmin): update the api https://github.com/googleapis/google-api-python-client/commit/96675a8d9158ec13353fe241f858201fc51b784d
feat(composer): update the api https://github.com/googleapis/google-api-python-client/commit/add2fbdc3afb6696537eb087bc1d79df9194a37a
feat(container): update the api https://github.com/googleapis/google-api-python-client/commit/f8fae98db6d1943411b1a6c0f5a65dea336569f6
feat(content): update the api https://github.com/googleapis/google-api-python-client/commit/0814e009a4a11800db5b4afd7b6260e504c98047
feat(datacatalog): update the api https://github.com/googleapis/google-api-python-client/commit/99706059e58bb3d616253a1af2cd162b5a0b0279
feat(dataflow): update the api https://github.com/googleapis/google-api-python-client/commit/d5f09ef30392532bcfdd82901148bdd3ac6eec01
feat(docs): update the api https://github.com/googleapis/google-api-python-client/commit/dc66f4cafba86baff6149b2f6e59ae1888006911
feat(file): update the api https://github.com/googleapis/google-api-python-client/commit/523fc5c900f53489d56400deb650f6586c9681a0
feat(firebasehosting): update the api https://github.com/googleapis/google-api-python-client/commit/c83ac386b65f82e7ba29851d56b496b09a29cf98
feat(healthcare): update the api https://github.com/googleapis/google-api-python-client/commit/a407471b14349b8c08018196041568f2a35f8d4f
feat(ideahub): update the api https://github.com/googleapis/google-api-python-client/commit/c6b0d83940f238b1330896240492e8db397dcd15
fix(keep): update the api https://github.com/googleapis/google-api-python-client/commit/08fee732e96d3220e624c8fca7b8a9b0c0bcb146
feat(managedidentities): update the api https://github.com/googleapis/google-api-python-client/commit/863b333da7848029fd1614fd48b46cfbe12afcd5
feat(memcache): update the api https://github.com/googleapis/google-api-python-client/commit/17dc001e4649f54944066ce153e3c552c850a146
feat(metastore): update the api https://github.com/googleapis/google-api-python-client/commit/f3a76c9359babc48cc0b76ce7e3be0711ba028ae
feat(slides): update the api https://github.com/googleapis/google-api-python-client/commit/314d61b9ef8c5c30f9756462504dc0df92284cb2
feat(sqladmin): update the api https://github.com/googleapis/google-api-python-client/commit/62784e0b1b5752b480afe1ddd77dcf412bb35dbb
feat(tpu): update the api https://github.com/googleapis/google-api-python-client/commit/16bf712cca4a393d96e4135de3d02e5005051b6d
feat(youtube): update the api https://github.com/googleapis/google-api-python-client/commit/ec21dff96d9538ad6c7f9b318eca88178533aa95
diff --git a/docs/dyn/dialogflow_v3.projects.locations.agents.environments.experiments.html b/docs/dyn/dialogflow_v3.projects.locations.agents.environments.experiments.html
index 004199a..bedf720 100644
--- a/docs/dyn/dialogflow_v3.projects.locations.agents.environments.experiments.html
+++ b/docs/dyn/dialogflow_v3.projects.locations.agents.environments.experiments.html
@@ -133,7 +133,7 @@
   "description": "A String", # The human-readable description of the experiment.
   "displayName": "A String", # Required. The human-readable name of the experiment (unique in an environment). Limit of 64 characters.
   "endTime": "A String", # End time of this experiment.
-  "experimentLength": "A String", # Maximum number of days to run the experiment/rollout. If auto-rollout is not enabled, default value and maximum will be 30 days. If auto-rollout is enabled, default value and maximum will be 6 days.
+  "experimentLength": "A String", # LINT.IfChange(default_experiment_length) Maximum number of days to run the experiment/rollout. If auto-rollout is not enabled, default value and maximum will be 30 days. If auto-rollout is enabled, default value and maximum will be 6 days. LINT.ThenChange(//depot/google3/cloud/ml/api/conversation/analytics/compute.cc:default_experiment_length)
   "lastUpdateTime": "A String", # Last update time of this experiment.
   "name": "A String", # The name of the experiment. Format: projects//locations//agents//environments//experiments/..
   "result": { # The inference result which includes an objective metric to optimize and the confidence interval. # Inference result of the experiment.
@@ -160,7 +160,7 @@
     ],
   },
   "startTime": "A String", # Start time of this experiment.
-  "state": "A String", # The current state of the experiment. Transition triggered by Expriments.StartExperiment: PENDING->RUNNING. Transition triggered by Expriments.CancelExperiment: PENDING->CANCELLED or RUNNING->CANCELLED.
+  "state": "A String", # The current state of the experiment. Transition triggered by Experiments.StartExperiment: DRAFT->RUNNING. Transition triggered by Experiments.CancelExperiment: DRAFT->DONE or RUNNING->DONE.
   "variantsHistory": [ # The history of updates to the experiment variants.
     { # The history of variants update.
       "updateTime": "A String", # Update time of the variants.
@@ -202,7 +202,7 @@
   "description": "A String", # The human-readable description of the experiment.
   "displayName": "A String", # Required. The human-readable name of the experiment (unique in an environment). Limit of 64 characters.
   "endTime": "A String", # End time of this experiment.
-  "experimentLength": "A String", # Maximum number of days to run the experiment/rollout. If auto-rollout is not enabled, default value and maximum will be 30 days. If auto-rollout is enabled, default value and maximum will be 6 days.
+  "experimentLength": "A String", # LINT.IfChange(default_experiment_length) Maximum number of days to run the experiment/rollout. If auto-rollout is not enabled, default value and maximum will be 30 days. If auto-rollout is enabled, default value and maximum will be 6 days. LINT.ThenChange(//depot/google3/cloud/ml/api/conversation/analytics/compute.cc:default_experiment_length)
   "lastUpdateTime": "A String", # Last update time of this experiment.
   "name": "A String", # The name of the experiment. Format: projects//locations//agents//environments//experiments/..
   "result": { # The inference result which includes an objective metric to optimize and the confidence interval. # Inference result of the experiment.
@@ -229,7 +229,7 @@
     ],
   },
   "startTime": "A String", # Start time of this experiment.
-  "state": "A String", # The current state of the experiment. Transition triggered by Expriments.StartExperiment: PENDING->RUNNING. Transition triggered by Expriments.CancelExperiment: PENDING->CANCELLED or RUNNING->CANCELLED.
+  "state": "A String", # The current state of the experiment. Transition triggered by Experiments.StartExperiment: DRAFT->RUNNING. Transition triggered by Experiments.CancelExperiment: DRAFT->DONE or RUNNING->DONE.
   "variantsHistory": [ # The history of updates to the experiment variants.
     { # The history of variants update.
       "updateTime": "A String", # Update time of the variants.
@@ -296,7 +296,7 @@
   "description": "A String", # The human-readable description of the experiment.
   "displayName": "A String", # Required. The human-readable name of the experiment (unique in an environment). Limit of 64 characters.
   "endTime": "A String", # End time of this experiment.
-  "experimentLength": "A String", # Maximum number of days to run the experiment/rollout. If auto-rollout is not enabled, default value and maximum will be 30 days. If auto-rollout is enabled, default value and maximum will be 6 days.
+  "experimentLength": "A String", # LINT.IfChange(default_experiment_length) Maximum number of days to run the experiment/rollout. If auto-rollout is not enabled, default value and maximum will be 30 days. If auto-rollout is enabled, default value and maximum will be 6 days. LINT.ThenChange(//depot/google3/cloud/ml/api/conversation/analytics/compute.cc:default_experiment_length)
   "lastUpdateTime": "A String", # Last update time of this experiment.
   "name": "A String", # The name of the experiment. Format: projects//locations//agents//environments//experiments/..
   "result": { # The inference result which includes an objective metric to optimize and the confidence interval. # Inference result of the experiment.
@@ -323,7 +323,7 @@
     ],
   },
   "startTime": "A String", # Start time of this experiment.
-  "state": "A String", # The current state of the experiment. Transition triggered by Expriments.StartExperiment: PENDING->RUNNING. Transition triggered by Expriments.CancelExperiment: PENDING->CANCELLED or RUNNING->CANCELLED.
+  "state": "A String", # The current state of the experiment. Transition triggered by Experiments.StartExperiment: DRAFT->RUNNING. Transition triggered by Experiments.CancelExperiment: DRAFT->DONE or RUNNING->DONE.
   "variantsHistory": [ # The history of updates to the experiment variants.
     { # The history of variants update.
       "updateTime": "A String", # Update time of the variants.
@@ -376,7 +376,7 @@
       "description": "A String", # The human-readable description of the experiment.
       "displayName": "A String", # Required. The human-readable name of the experiment (unique in an environment). Limit of 64 characters.
       "endTime": "A String", # End time of this experiment.
-      "experimentLength": "A String", # Maximum number of days to run the experiment/rollout. If auto-rollout is not enabled, default value and maximum will be 30 days. If auto-rollout is enabled, default value and maximum will be 6 days.
+      "experimentLength": "A String", # LINT.IfChange(default_experiment_length) Maximum number of days to run the experiment/rollout. If auto-rollout is not enabled, default value and maximum will be 30 days. If auto-rollout is enabled, default value and maximum will be 6 days. LINT.ThenChange(//depot/google3/cloud/ml/api/conversation/analytics/compute.cc:default_experiment_length)
       "lastUpdateTime": "A String", # Last update time of this experiment.
       "name": "A String", # The name of the experiment. Format: projects//locations//agents//environments//experiments/..
       "result": { # The inference result which includes an objective metric to optimize and the confidence interval. # Inference result of the experiment.
@@ -403,7 +403,7 @@
         ],
       },
       "startTime": "A String", # Start time of this experiment.
-      "state": "A String", # The current state of the experiment. Transition triggered by Expriments.StartExperiment: PENDING->RUNNING. Transition triggered by Expriments.CancelExperiment: PENDING->CANCELLED or RUNNING->CANCELLED.
+      "state": "A String", # The current state of the experiment. Transition triggered by Experiments.StartExperiment: DRAFT->RUNNING. Transition triggered by Experiments.CancelExperiment: DRAFT->DONE or RUNNING->DONE.
       "variantsHistory": [ # The history of updates to the experiment variants.
         { # The history of variants update.
           "updateTime": "A String", # Update time of the variants.
@@ -464,7 +464,7 @@
   "description": "A String", # The human-readable description of the experiment.
   "displayName": "A String", # Required. The human-readable name of the experiment (unique in an environment). Limit of 64 characters.
   "endTime": "A String", # End time of this experiment.
-  "experimentLength": "A String", # Maximum number of days to run the experiment/rollout. If auto-rollout is not enabled, default value and maximum will be 30 days. If auto-rollout is enabled, default value and maximum will be 6 days.
+  "experimentLength": "A String", # LINT.IfChange(default_experiment_length) Maximum number of days to run the experiment/rollout. If auto-rollout is not enabled, default value and maximum will be 30 days. If auto-rollout is enabled, default value and maximum will be 6 days. LINT.ThenChange(//depot/google3/cloud/ml/api/conversation/analytics/compute.cc:default_experiment_length)
   "lastUpdateTime": "A String", # Last update time of this experiment.
   "name": "A String", # The name of the experiment. Format: projects//locations//agents//environments//experiments/..
   "result": { # The inference result which includes an objective metric to optimize and the confidence interval. # Inference result of the experiment.
@@ -491,7 +491,7 @@
     ],
   },
   "startTime": "A String", # Start time of this experiment.
-  "state": "A String", # The current state of the experiment. Transition triggered by Expriments.StartExperiment: PENDING->RUNNING. Transition triggered by Expriments.CancelExperiment: PENDING->CANCELLED or RUNNING->CANCELLED.
+  "state": "A String", # The current state of the experiment. Transition triggered by Experiments.StartExperiment: DRAFT->RUNNING. Transition triggered by Experiments.CancelExperiment: DRAFT->DONE or RUNNING->DONE.
   "variantsHistory": [ # The history of updates to the experiment variants.
     { # The history of variants update.
       "updateTime": "A String", # Update time of the variants.
@@ -534,7 +534,7 @@
   "description": "A String", # The human-readable description of the experiment.
   "displayName": "A String", # Required. The human-readable name of the experiment (unique in an environment). Limit of 64 characters.
   "endTime": "A String", # End time of this experiment.
-  "experimentLength": "A String", # Maximum number of days to run the experiment/rollout. If auto-rollout is not enabled, default value and maximum will be 30 days. If auto-rollout is enabled, default value and maximum will be 6 days.
+  "experimentLength": "A String", # LINT.IfChange(default_experiment_length) Maximum number of days to run the experiment/rollout. If auto-rollout is not enabled, default value and maximum will be 30 days. If auto-rollout is enabled, default value and maximum will be 6 days. LINT.ThenChange(//depot/google3/cloud/ml/api/conversation/analytics/compute.cc:default_experiment_length)
   "lastUpdateTime": "A String", # Last update time of this experiment.
   "name": "A String", # The name of the experiment. Format: projects//locations//agents//environments//experiments/..
   "result": { # The inference result which includes an objective metric to optimize and the confidence interval. # Inference result of the experiment.
@@ -561,7 +561,7 @@
     ],
   },
   "startTime": "A String", # Start time of this experiment.
-  "state": "A String", # The current state of the experiment. Transition triggered by Expriments.StartExperiment: PENDING->RUNNING. Transition triggered by Expriments.CancelExperiment: PENDING->CANCELLED or RUNNING->CANCELLED.
+  "state": "A String", # The current state of the experiment. Transition triggered by Experiments.StartExperiment: DRAFT->RUNNING. Transition triggered by Experiments.CancelExperiment: DRAFT->DONE or RUNNING->DONE.
   "variantsHistory": [ # The history of updates to the experiment variants.
     { # The history of variants update.
       "updateTime": "A String", # Update time of the variants.
@@ -616,7 +616,7 @@
   "description": "A String", # The human-readable description of the experiment.
   "displayName": "A String", # Required. The human-readable name of the experiment (unique in an environment). Limit of 64 characters.
   "endTime": "A String", # End time of this experiment.
-  "experimentLength": "A String", # Maximum number of days to run the experiment/rollout. If auto-rollout is not enabled, default value and maximum will be 30 days. If auto-rollout is enabled, default value and maximum will be 6 days.
+  "experimentLength": "A String", # LINT.IfChange(default_experiment_length) Maximum number of days to run the experiment/rollout. If auto-rollout is not enabled, default value and maximum will be 30 days. If auto-rollout is enabled, default value and maximum will be 6 days. LINT.ThenChange(//depot/google3/cloud/ml/api/conversation/analytics/compute.cc:default_experiment_length)
   "lastUpdateTime": "A String", # Last update time of this experiment.
   "name": "A String", # The name of the experiment. Format: projects//locations//agents//environments//experiments/..
   "result": { # The inference result which includes an objective metric to optimize and the confidence interval. # Inference result of the experiment.
@@ -643,7 +643,7 @@
     ],
   },
   "startTime": "A String", # Start time of this experiment.
-  "state": "A String", # The current state of the experiment. Transition triggered by Expriments.StartExperiment: PENDING->RUNNING. Transition triggered by Expriments.CancelExperiment: PENDING->CANCELLED or RUNNING->CANCELLED.
+  "state": "A String", # The current state of the experiment. Transition triggered by Experiments.StartExperiment: DRAFT->RUNNING. Transition triggered by Experiments.CancelExperiment: DRAFT->DONE or RUNNING->DONE.
   "variantsHistory": [ # The history of updates to the experiment variants.
     { # The history of variants update.
       "updateTime": "A String", # Update time of the variants.
@@ -698,7 +698,7 @@
   "description": "A String", # The human-readable description of the experiment.
   "displayName": "A String", # Required. The human-readable name of the experiment (unique in an environment). Limit of 64 characters.
   "endTime": "A String", # End time of this experiment.
-  "experimentLength": "A String", # Maximum number of days to run the experiment/rollout. If auto-rollout is not enabled, default value and maximum will be 30 days. If auto-rollout is enabled, default value and maximum will be 6 days.
+  "experimentLength": "A String", # LINT.IfChange(default_experiment_length) Maximum number of days to run the experiment/rollout. If auto-rollout is not enabled, default value and maximum will be 30 days. If auto-rollout is enabled, default value and maximum will be 6 days. LINT.ThenChange(//depot/google3/cloud/ml/api/conversation/analytics/compute.cc:default_experiment_length)
   "lastUpdateTime": "A String", # Last update time of this experiment.
   "name": "A String", # The name of the experiment. Format: projects//locations//agents//environments//experiments/..
   "result": { # The inference result which includes an objective metric to optimize and the confidence interval. # Inference result of the experiment.
@@ -725,7 +725,7 @@
     ],
   },
   "startTime": "A String", # Start time of this experiment.
-  "state": "A String", # The current state of the experiment. Transition triggered by Expriments.StartExperiment: PENDING->RUNNING. Transition triggered by Expriments.CancelExperiment: PENDING->CANCELLED or RUNNING->CANCELLED.
+  "state": "A String", # The current state of the experiment. Transition triggered by Experiments.StartExperiment: DRAFT->RUNNING. Transition triggered by Experiments.CancelExperiment: DRAFT->DONE or RUNNING->DONE.
   "variantsHistory": [ # The history of updates to the experiment variants.
     { # The history of variants update.
       "updateTime": "A String", # Update time of the variants.