[Feature flag] Cleanup gitea_user_mapping

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Summary

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

Since UCM will be the default, and only, approach for contribution assignment, the flag can be removed.

Let's make sure to also clean up our docs, i.e., remove any mention of this flag and the deprecated user mapping approach in our docs.

• https://gitlab.com/gitlab-org/gitlab/-/issues/467084

From the refinement notes:

It's worth noting that various specs for Bitbucket Server, Gitea, and GitHub importers use the :import_user_mapping_enabled trait when creating a project from a factory. Once all of the old user mapping code is removed, we can remove that trait as well. Since we'll likely be cleaning up all of these flags simultaneously, it might be easier to include that as a tiny 3rd MR or make sure it's in the last open cleanup MR

Owners

• Team: Import & Integrate
• Most appropriate slack channel to reach out to: #g_import_and_integrate
• Best individual to reach out to: @SamWord
• PM: @m_frankiewicz

Stakeholders

Expectations

What might happen if this goes wrong?

If there is an issue with this cleanup, we would need to decide whether to roll back the clean-up MR, or temporarily disable Gitea import. Individuals to contact: @m_frankiewicz and @wortschi.

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 gitea_user_mapping 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>
• If not already done, clean up the feature flag from all environments by running these chatops command in #production channel: /chatops run feature delete gitea_user_mapping --dev --pre --staging --staging-ref --production
• Close this rollout issue.