Merge branch '466143-projects-organization-id-fk' into 'master'

Add foreign key constraint to `projects.organization_id`

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/166980



Merged-by: Omar Qunsul <oqunsul@gitlab.com>
Approved-by: João Pereira <jpereira@gitlab.com>
Approved-by: Alex Pooley <apooley@gitlab.com>
Approved-by: Omar Qunsul <oqunsul@gitlab.com>
Co-authored-by: Abdul Wadood <awadood@gitlab.com>