[Feature flag] Cleanup of manage_pat_by_group_owners_ready

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Summary

This issue is to cleanup the manage_pat_by_group_owners_ready feature flag, after the feature flag has been enabled by default for an appropriate amount of time in production.

Owners

• Team: groupauthentication
• Most appropriate slack channel to reach out to: #g_sscs_authentication
• Best individual to reach out to: @habdul-razak
• PM: @jrandazzo
• EM: @adil.farrukh

Expectations

What might happen if this goes wrong?

• Multiple 400/401 errors in the logs https://log.gprd.gitlab.net/app/r/s/laYJm
• Revert !215796

Cleaning up the feature flag

• Specify in the issue description if this feature will be removed completely or will be productized as part of the Feature Flag cleanup
• Create a merge request to remove manage_pat_by_group_owners_ready feature flag. Ask for review and merge it.
  • Remove all references to the feature flag from the codebase.
  • Remove the YAML definitions for the feature from the repository.
  • Create a changelog entry.
• Ensure that the cleanup MR has been deployed to both production and canary. If the merge request was deployed before the code cutoff, the feature can be officially announced in a release blog post.
  • /chatops run auto_deploy status <merge-commit-of-cleanup-mr>
• Close the feature issue to indicate the feature will be released in the current milestone.
• If not already done, clean up the feature flag from all environments by running these chatops command in #production channel: /chatops run feature delete manage_pat_by_group_owners_ready --dev --pre --staging --staging-ref --production
• Close this rollout issue.