Merge branch...

Merge branch '503978-security_finding-create_merge_request_service-rollback-for-sec-db' into 'master' 

Support rollback for sec in SecurityFinding::CreateMergeRequestService

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/172673



Merged-by: Eugenia Grieff <egrieff@gitlab.com>
Approved-by: Arpit Gogia <12347103-arpitgogia@users.noreply.gitlab.com>
Approved-by: Pavel Shutsin <pshutsin@gitlab.com>
Approved-by: Eugenia Grieff <egrieff@gitlab.com>
Reviewed-by: Brian Williams <bwilliams@gitlab.com>
Co-authored-by: Fabien Catteau <fcatteau@gitlab.com>