Remove HipChat project service
We removed this in https://gitlab.com/gitlab-org/gitlab-ce/issues/52424 but it caused some issues as on-prem HipChat is still available.
https://gitlab.com/gitlab-org/gitlab-ce/issues/60042 is the issue where we added this back.
I'm going to put this in 12.1 for now but we might decide to push it back further.