[FF] `enable_vulnerability_resolution` - Cleanup

Summary

This issue is to clean up the enable_vulnerability_resolution feature flag that has been rolled out and is now stable.

Cleanup Steps

• Create a merge request to remove the enable_vulnerability_resolution feature flag. Ask for review/approval/merge as usual. The MR should include the following changes:
  • Remove all references to the feature flag from the codebase.
  • Remove the YAML definitions for the feature from the repository.
• Ensure that the cleanup MR has been included in the release package. If the merge request was deployed before the monthly release was tagged, the feature can be officially announced in a release blog post: /chatops run release check <merge-request-url> <milestone>
• Once the cleanup MR has been deployed to production, clean up the feature flag from all environments by running these chatops command in #production channel: /chatops run feature delete enable_vulnerability_resolution --dev --pre --staging --staging-ref --production
• Close this cleanup issue.