Reduce N+1 queries when approvals by committers are not allowed

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/144860



Merged-by: Luke Duncalfe <lduncalfe@gitlab.com>
Approved-by: Huzaifa Iftikhar <hiftikhar@gitlab.com>
Approved-by: Tiger Watson <twatson@gitlab.com>
Approved-by: Luke Duncalfe <lduncalfe@gitlab.com>
Approved-by: Marc Shaw <mshaw@gitlab.com>
Reviewed-by: Huzaifa Iftikhar <hiftikhar@gitlab.com>
Co-authored-by: Patrick Bajao <ebajao@gitlab.com>