[Feature flag] Cleanup self_managed_scim_group_sync

Summary

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

Rollout issue: [FF] `self_managed_scim_group_sync` -- SCIM gro... (#553662 - closed)

Feature epic: Group Sync using SCIM for Self-managed (&15990 - closed)

The feature will keep existing and will be maintained going forward.

Owners

• Team: groupseat management
• Most appropriate slack channel to reach out to: #g_seat_management
• Best individual to reach out to: @paulobarros
• PM: @m_frankiewicz
• EM: @rhardarson

Stakeholders

TBD

Expectations

What might happen if this goes wrong?

N/A

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 self_managed_scim_group_sync 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 <feature-flag-name> --dev --pre --staging --staging-ref --production
• Close this rollout issue.