Feature flag: approval_committer_emails_from_diff

Summary

Feature flag for approval_committer_emails_from_diff introduced in !223603 (merged).

This flag controls whether the approval committer filtering flow uses a direct SQL UNION query to extract committer emails from merge_request_diff_commits, instead of instantiating all MergeRequestDiffCommit Ruby objects via the committers() method.

Owners

• Team: code review
• Feature issue: !223603 (merged)

Expected Artifacts

• Feature flag: approval_committer_emails_from_diff
• Type: gitlab_com_derisk
• Default: disabled

Rollout Plan

1. Enable on staging
2. Enable on gitlab.com for a percentage of projects
3. Enable globally on gitlab.com
4. Enable by default (remove flag)