[designate] Transition Xena to EM

This transition the stable/xena 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 after the transition.

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 April 20th, 2023.

Change-Id: I935cd1a0d410717981e3ecfc3ee42631dc19feb1

deliverables/xena/designate-dashboard.yaml

@@ -20,6 +20,10 @@ releases:
     projects:
       - repo: openstack/designate-dashboard
         hash: 907727702f9b77ef25a585ab5d2414ecf758b767
+  - version: xena-em
+    projects:
+      - repo: openstack/designate-dashboard
+        hash: 907727702f9b77ef25a585ab5d2414ecf758b767
 branches:
   - name: stable/xena
     location: 13.0.0.0rc1

deliverables/xena/designate.yaml

@@ -29,6 +29,10 @@ releases:
     projects:
       - repo: openstack/designate
         hash: 019b1ae9cb54f06f7b754024687e9f0fdfad9534
+  - version: xena-em
+    projects:
+      - repo: openstack/designate
+        hash: 019b1ae9cb54f06f7b754024687e9f0fdfad9534
 branches:
   - name: stable/xena
     location: 13.0.0.0rc1

deliverables/xena/python-designateclient.yaml

@@ -15,6 +15,10 @@ releases:
     projects:
       - repo: openstack/python-designateclient
         hash: 018b722f43c0d2ae59edee3051cf52160e0c73d9
+  - version: xena-em
+    projects:
+      - repo: openstack/python-designateclient
+        hash: 018b722f43c0d2ae59edee3051cf52160e0c73d9
 branches:
   - name: stable/xena
     location: 4.3.0