Merge branch 'fix-migration-helper' into 'master'
Add helpers to exactly undo cleanup_concurrent_column_rename See merge request gitlab-org/gitlab-ce!32183 (cherry picked from commit fc08d48c) 9b592a59 Add helper to exactly undo cleanup_concurrent_column_rename 61777843 Add spec for undo_rename_column_concurrently d28ad870 Add spec for when default is false