[ec2-api] 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: Iaec4360c85bc218efd6f29db8c3017ea92e8a0f1

deliverables/wallaby/ec2-api.yaml

@@ -20,6 +20,10 @@ releases:
     projects:
       - repo: openstack/ec2-api
         hash: 0466881b9a74392f64c8b2fddffbea5a23ba5eb9
+  - version: wallaby-em
+    projects:
+      - repo: openstack/ec2-api
+        hash: 0466881b9a74392f64c8b2fddffbea5a23ba5eb9
 branches:
   - name: stable/wallaby
     location: 12.0.0.0rc1