Auto-generate review summary when submitted

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/124581



Merged-by: Kerri Miller <kerrizor@kerrizor.com>
Approved-by: Marc Shaw <mshaw@gitlab.com>
Approved-by: Kerri Miller <kerrizor@kerrizor.com>
Reviewed-by: Patrick Bajao <ebajao@gitlab.com>
Reviewed-by: Marc Shaw <mshaw@gitlab.com>
Co-authored-by: Patrick Bajao <ebajao@gitlab.com>