Merge branch '409873-drop-registry-migration-columns-from-app-settings' into 'master'

Remove registry migration-related columns in application settings

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/153521



Merged-by: Pavel Shutsin <pshutsin@gitlab.com>
Approved-by: Pavel Shutsin <pshutsin@gitlab.com>
Reviewed-by: Pavel Shutsin <pshutsin@gitlab.com>
Reviewed-by: Mohamed Hamda <mhamda@gitlab.com>
Co-authored-by: Adie Po <avpfestin@gitlab.com>