[zun] Transition Yoga to Unmaintained

With the new TC resolution the community replaces Extended Maintenance
with Unmaintained status [1].

So this patch transitions stable/yoga branch to Unmaintained as follows:
- tip of the stable/yoga branch is tagged with yoga-eom tag
- unmaintained/yoga branch will be cut from yoga-eom tag
- stable/yoga branch will be deleted

Some further notes:
- there will no longer be official releases off of yoga branch
- backports can be pushed against unmaintained/yoga branch
- openstack-unmaintained-core and <project>-unmaintained-core groups
  will have the rights to merge patches

For further details please read the resolution [1] & review and +1 this
patch if this is correct as soon as possible.

[1] https://governance.openstack.org/tc/resolutions/20230724-unmaintained-branches.html

Change-Id: I3ec79e6ff203a8ef7b4ceb2e90e36d4ee35c559c

deliverables/yoga/python-zunclient.yaml

@@ -11,6 +11,12 @@ releases:
     projects:
       - repo: openstack/python-zunclient
         hash: 2284443ac9572ef337df38424f69a820c369de38
+  - version: yoga-eom
+    projects:
+      - repo: openstack/python-zunclient
+        hash: 382bab7c237ccf2c15dd4f1f2d721e220d39c6bf
 branches:
   - name: stable/yoga
     location: 4.4.0
+  - name: unmaintained/yoga
+    location: yoga-eom

deliverables/yoga/zun-ui.yaml

@@ -15,7 +15,13 @@ releases:
       - repo: openstack/zun-ui
         hash: 20ae779160643bcce708c04ddcdce21910bd5d41
     diff-start: 8.0.0
+  - version: yoga-eom
+    projects:
+      - repo: openstack/zun-ui
+        hash: bbccc2399bc180ff5adb475c543bff28856e05b9
 branches:
   - name: stable/yoga
     location: 9.0.0.0rc1
+  - name: unmaintained/yoga
+    location: yoga-eom
 release-notes: https://docs.openstack.org/releasenotes/zun-ui/yoga.html

deliverables/yoga/zun.yaml

@@ -19,7 +19,13 @@ releases:
     projects:
       - repo: openstack/zun
         hash: 77fcbbefead3fbd79be25971d9b94ce0359cecda
+  - version: yoga-eom
+    projects:
+      - repo: openstack/zun
+        hash: 77fcbbefead3fbd79be25971d9b94ce0359cecda
 branches:
   - name: stable/yoga
     location: 9.0.0.0rc1
+  - name: unmaintained/yoga
+    location: yoga-eom
 release-notes: https://docs.openstack.org/releasenotes/zun/yoga.html