[OpenStackAnsible] Transition Wallaby to EM

This transition the wallaby branch to extended maintenance.
Changes for bugfixes and things the team deems important are
still encouraged, but there will no longer be official releases
off of the branch.

Please +1 if the team is ready for us to proceed with this
transition, or -1 if there are any final backports currently in
flight that we should wait for. For the latter case, please
update the patch with the new commit hash after doing a final
release to get those changes out so we know to proceed with the
transition.

The transition deadline is November 2nd, 2022.

Change-Id: I808f3b08e845af0330404650807d32a44047cf01

deliverables/wallaby/openstack-ansible.yaml

@@ -86,6 +86,10 @@ releases:
     projects:
       - repo: openstack/openstack-ansible
         hash: 91f0009dcbd45e0828f6d47e70930c524b37fc5d
+  - version: wallaby-em
+    projects:
+      - repo: openstack/openstack-ansible
+        hash: 91f0009dcbd45e0828f6d47e70930c524b37fc5d
 branches:
   - name: stable/wallaby
     location: 23.0.0.0rc1