Merge branch 'make-namespace-read-only-with-seat-overage' into 'master'

Set Namespace to Read-Only if it Has a Seat Overage

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/147500



Merged-by: Suraj Tripathi <stripathi@gitlab.com>
Approved-by: Suraj Tripathi <stripathi@gitlab.com>
Reviewed-by: Vijay Hawoldar <vhawoldar@gitlab.com>
Co-authored-by: Jason Goodman <jgoodman@gitlab.com>