User Account - Block deletion with org ownership

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/170660



Merged-by: Sylvester Chin <schin@gitlab.com>
Approved-by: Mike Nichols <mnichols@gitlab.com>
Approved-by: Sam Word <sword@gitlab.com>
Approved-by: Sylvester Chin <schin@gitlab.com>
Reviewed-by: Zack Cuddy <zcuddy@gitlab.com>
Reviewed-by: Chad Woolley <cwoolley@gitlab.com>
Reviewed-by: Sam Word <sword@gitlab.com>
Co-authored-by: Zachary Cuddy <zcuddy@gitlab.com>