We used to replicate every openstack/* project to GitHub,
through a global replication at Gerrit-level. Now that the job for
granular replication is in place, we can stop the global replication,
so that only active/official repositories are synced.
Depends-On: https://review.opendev.org/724310
Change-Id: Ibba02e626e33aba9779f771d5ae49920bac86b19