[Tree Status] Update all references in Skia repo to tree-status

* Mainly updates to documentation.
* Fix some comments in PRESUBMIT.py.
* Delete tools/lua/trigger_ct_lua. It has not worked in many years.

Bug: skia:9962
Change-Id: If6f58f173f2c8bd3fc9bdfc4db440f42489fee08
Docs-Preview: https://skia.org/?cl=274597
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/274597
Commit-Queue: Ravi Mistry <rmistry@google.com>
Reviewed-by: Eric Boren <borenet@google.com>
diff --git a/PRESUBMIT.py b/PRESUBMIT.py
index eba1836..6660744 100644
--- a/PRESUBMIT.py
+++ b/PRESUBMIT.py
@@ -282,11 +282,7 @@
 
 
 def CheckChangeOnUpload(input_api, output_api):
-  """Presubmit checks for the change on upload.
-
-  The following are the presubmit checks:
-  * Check change has one and only one EOL.
-  """
+  """Presubmit checks for the change on upload."""
   results = []
   results.extend(_CommonChecks(input_api, output_api))
   # Run on upload, not commit, since the presubmit bot apparently doesn't have
@@ -524,14 +520,7 @@
 
 
 def CheckChangeOnCommit(input_api, output_api):
-  """Presubmit checks for the change on commit.
-
-  The following are the presubmit checks:
-  * Check change has one and only one EOL.
-  * Ensures that the Skia tree is open in
-    http://skia-tree-status.appspot.com/. Shows a warning if it is in 'Caution'
-    state and an error if it is in 'Closed' state.
-  """
+  """Presubmit checks for the change on commit."""
   results = []
   results.extend(_CommonChecks(input_api, output_api))
   results.extend(_CheckLGTMsForPublicAPI(input_api, output_api))