Merge branch '391424-remove-project-group-duplication' into 'master'

Consolidate group and project member send_invite code

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/140262



Merged-by: Aaron Huntsman <ahuntsman@gitlab.com>
Approved-by: Aaron Huntsman <ahuntsman@gitlab.com>
Reviewed-by: Doug Stull <dstull@gitlab.com>
Reviewed-by: Panos Kanellidis <pkanellidis@gitlab.com>
Co-authored-by: Doug Stull <dstull@gitlab.com>