Merge branch '419193-remove-name-collision-exceptions' into 'master'

Performing some cleanup of the migration collision checker

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/145852



Merged-by: Leonardo da Rosa <ldarosa@gitlab.com>
Approved-by: Leonardo da Rosa <ldarosa@gitlab.com>
Approved-by: Mario Celi <mcelicalderon@gitlab.com>
Reviewed-by: Leonardo da Rosa <ldarosa@gitlab.com>
Co-authored-by: Doug Stull <dstull@gitlab.com>