chore: Update discovery artifacts (#1325)

## Deleted keys were detected in the following stable discovery artifacts:
apigeev1[ [More details]](https://github.com/googleapis/google-api-python-client/commit/9106808da3e03faa4c27913358e0c07edd82ff5a)

## Discovery Artifact Change Summary:
apigeev1[ [More details]](https://github.com/googleapis/google-api-python-client/commit/9106808da3e03faa4c27913358e0c07edd82ff5a)
dataflowv1b3[ [More details]](https://github.com/googleapis/google-api-python-client/commit/9dd646184e70a83831f3347fc01a3eb0090ca0e8)
dialogflowv2[ [More details]](https://github.com/googleapis/google-api-python-client/commit/a7f2e96e6b283771e986d9ec7f1f057ff67e2a29)
dialogflowv2beta1[ [More details]](https://github.com/googleapis/google-api-python-client/commit/a7f2e96e6b283771e986d9ec7f1f057ff67e2a29)
dialogflowv3[ [More details]](https://github.com/googleapis/google-api-python-client/commit/a7f2e96e6b283771e986d9ec7f1f057ff67e2a29)
documentaiv1beta3[ [More details]](https://github.com/googleapis/google-api-python-client/commit/ee1318d36230ff4b7393ce1f15d6a9ee71d23cea)
healthcarev1[ [More details]](https://github.com/googleapis/google-api-python-client/commit/1204c1d486e08630773812ff1cc35843d98eb1d8)

feat(apigee): update the api
feat(dataflow): update the api
feat(dialogflow): update the api
feat(documentai): update the api
feat(healthcare): update the api

diff --git a/docs/dyn/dns_v1beta2.managedZoneOperations.html b/docs/dyn/dns_v1beta2.managedZoneOperations.html
index 1c7da52..655b404 100644
--- a/docs/dyn/dns_v1beta2.managedZoneOperations.html
+++ b/docs/dyn/dns_v1beta2.managedZoneOperations.html
@@ -202,12 +202,6 @@
         },
       },
       "privateVisibilityConfig": { # For privately visible zones, the set of Virtual Private Cloud resources that the zone is visible from.
-        "gkeClusters": [ # The list of Google Kubernetes Engine clusters that can see this zone.
-          {
-            "gkeClusterName": "A String", # The resource name of the cluster to bind this ManagedZone to. This should be specified in the format like: projects/*/locations/*/clusters/*. This is referenced from GKE projects.locations.clusters.get API: https://cloud.google.com/kubernetes-engine/docs/reference/rest/v1/projects.locations.clusters/get
-            "kind": "dns#managedZonePrivateVisibilityConfigGKECluster",
-          },
-        ],
         "kind": "dns#managedZonePrivateVisibilityConfig",
         "networks": [ # The list of VPC networks that can see this zone.
           {
@@ -276,12 +270,6 @@
         },
       },
       "privateVisibilityConfig": { # For privately visible zones, the set of Virtual Private Cloud resources that the zone is visible from.
-        "gkeClusters": [ # The list of Google Kubernetes Engine clusters that can see this zone.
-          {
-            "gkeClusterName": "A String", # The resource name of the cluster to bind this ManagedZone to. This should be specified in the format like: projects/*/locations/*/clusters/*. This is referenced from GKE projects.locations.clusters.get API: https://cloud.google.com/kubernetes-engine/docs/reference/rest/v1/projects.locations.clusters/get
-            "kind": "dns#managedZonePrivateVisibilityConfigGKECluster",
-          },
-        ],
         "kind": "dns#managedZonePrivateVisibilityConfig",
         "networks": [ # The list of VPC networks that can see this zone.
           {
@@ -332,7 +320,7 @@
   "header": { # Elements common to every response.
     "operationId": "A String", # For mutating operation requests that completed successfully. This is the client_operation_id if the client specified it, otherwise it is generated by the server (output only).
   },
-  "kind": "dns#managedZoneOperationsListResponse", # Type of resource.
+  "kind": "dns#managedZoneOperationsListResponse",
   "nextPageToken": "A String", # The presence of this field indicates that there exist more results following your last page of results in pagination order. To fetch them, make another list request using this value as your page token. This lets you retrieve the complete contents of even very large collections one page at a time. However, if the contents of the collection change between the first and last paginated list request, the set of all elements returned are an inconsistent view of the collection. You cannot retrieve a consistent snapshot of a collection larger than the maximum page size.
   "operations": [ # The operation resources.
     { # An operation represents a successful mutation performed on a Cloud DNS resource. Operations provide: - An audit log of server resource mutations. - A way to recover/retry API calls in the case where the response is never received by the caller. Use the caller specified client_operation_id.
@@ -428,12 +416,6 @@
             },
           },
           "privateVisibilityConfig": { # For privately visible zones, the set of Virtual Private Cloud resources that the zone is visible from.
-            "gkeClusters": [ # The list of Google Kubernetes Engine clusters that can see this zone.
-              {
-                "gkeClusterName": "A String", # The resource name of the cluster to bind this ManagedZone to. This should be specified in the format like: projects/*/locations/*/clusters/*. This is referenced from GKE projects.locations.clusters.get API: https://cloud.google.com/kubernetes-engine/docs/reference/rest/v1/projects.locations.clusters/get
-                "kind": "dns#managedZonePrivateVisibilityConfigGKECluster",
-              },
-            ],
             "kind": "dns#managedZonePrivateVisibilityConfig",
             "networks": [ # The list of VPC networks that can see this zone.
               {
@@ -502,12 +484,6 @@
             },
           },
           "privateVisibilityConfig": { # For privately visible zones, the set of Virtual Private Cloud resources that the zone is visible from.
-            "gkeClusters": [ # The list of Google Kubernetes Engine clusters that can see this zone.
-              {
-                "gkeClusterName": "A String", # The resource name of the cluster to bind this ManagedZone to. This should be specified in the format like: projects/*/locations/*/clusters/*. This is referenced from GKE projects.locations.clusters.get API: https://cloud.google.com/kubernetes-engine/docs/reference/rest/v1/projects.locations.clusters/get
-                "kind": "dns#managedZonePrivateVisibilityConfigGKECluster",
-              },
-            ],
             "kind": "dns#managedZonePrivateVisibilityConfig",
             "networks": [ # The list of VPC networks that can see this zone.
               {