Disable global Github replication

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

playbooks/host_vars/review01.openstack.org.yaml

@@ -1,17 +1,4 @@
 gerrit_replication:
-  - name: 'github'
-    url: 'git@github.com:'
-    authGroup: 'Anonymous Users'
-    replicationDelay: '1'
-    replicatePermissions: false
-    mirror: true
-    projects:
-      - '^openstack/(?!ara$|ara-web$|ara-infra$).*'
-      - 'openstack-dev/*'
-      - 'openstack-infra/*'
-    push:
-      - '+refs/heads/*:refs/heads/*'
-      - '+refs/tags/*:refs/tags/*'
   - name: 'gitea01'
     url: 'ssh://git@gitea01.opendev.org:222/'
     authGroup: 'Anonymous Users'