Merge branch '346914-admin-warning' into 'master'

Show warning if code search mappings are outdated

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/99254



Merged-by: David Pisek <dpisek@gitlab.com>
Approved-by: John Mason <9717668-john-mason@users.noreply.gitlab.com>
Approved-by: Ashraf Khamis <akhamis@gitlab.com>
Approved-by: Coung Ngo <cngo@gitlab.com>
Approved-by: Terri Chu <tchu@gitlab.com>
Approved-by: David Pisek <dpisek@gitlab.com>
Co-authored-by: Dmitry Gruzd <dgruzd@gitlab.com>