Merge branch '512606-create-approval-rule-group-project-mr-joins' into 'master'

Add v2 approval rule associations to project group and mr

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/179861



Merged-by: Joe Woodward <jwoodward@gitlab.com>
Approved-by: Joe Woodward <jwoodward@gitlab.com>
Approved-by: Tiger Watson <twatson@gitlab.com>
Reviewed-by: Joe Woodward <jwoodward@gitlab.com>
Reviewed-by: Jerry Seto <jseto@gitlab.com>
Co-authored-by: ghinfey <ghinfey@gitlab.com>