chore: Update action labels

[tylerjroach]

• PR conforms to Pull Request guidelines.

Issue #, if available:

Description of changes:
Renames "pending-response" to "pending-community-response"
Adds "pending-maintainer-response" when new community issue opened
Removes "pending-maintainer-response" when owner/maintainer comments on issue
Adds "pending-maintainer-response" when community comments on issue
removes "pending-maintainer-response" when issue is closed
No longer considers "improvement" as reason to remove "pending-triage-label"

How did you test these changes?
(Please add a line here how the changes were tested)

Documentation update required?

• No
• Yes (Please include a PR link for the documentation update)

General Checklist

• Added Unit Tests
• Added Integration Tests
• Security oriented best practices and standards are followed (e.g. using input sanitization, principle of least privilege, etc)
• Ensure commit message has the appropriate scope (e.g fix(liveness): message, fix(authenticator): message, fix(all): message)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.