Enable ee_compat_check for forks, but not EE

Merged username-removed-423915 requested to merge 37713-enable-ee_compat_check-for-forks-ee into master

EE counterpart of https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/14189

What does this MR do?

Enable ee_compat_check for forks, but not EE

Are there points in the code the reviewer needs to double check?

EE of course doesn't need this, but could we do this without having conflicts?