[senlin] 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: I66e90cd8c4eaec3afb245239ce83ce770bb664ad

deliverables/yoga/python-senlinclient.yaml

@@ -11,7 +11,14 @@ releases:
     projects:
       - repo: openstack/python-senlinclient
         hash: 9fc2edcbba7e5c83b609f344ec42adf56ab34415
+  - version: yoga-eom
+    projects:
+      - repo: openstack/python-senlinclient
+        hash: 3385d5a41d660c9b12a1b700752383befef2168d
 branches:
   - name: stable/yoga
     location: 2.4.0
-release-notes: https://docs.openstack.org/releasenotes/python-senlinclient/yoga.html
+  - name: unmaintained/yoga
+    location: yoga-eom
+release-notes:
+  https://docs.openstack.org/releasenotes/python-senlinclient/yoga.html

deliverables/yoga/senlin-dashboard.yaml

@@ -15,7 +15,13 @@ releases:
       - repo: openstack/senlin-dashboard
         hash: 7f5258c3d8cc9daaca95fc0d9766c258b3e37d2f
     diff-start: 4.0.0
+  - version: yoga-eom
+    projects:
+      - repo: openstack/senlin-dashboard
+        hash: 1f00888ef099f6828fa0c6758f37ea4f9f30cb87
 branches:
   - name: stable/yoga
     location: 5.0.0.0rc1
+  - name: unmaintained/yoga
+    location: yoga-eom
 release-notes: https://docs.openstack.org/releasenotes/senlin-dashboard/yoga.html

deliverables/yoga/senlin.yaml

@@ -15,7 +15,13 @@ releases:
       - repo: openstack/senlin
         hash: 608e80b9ac6602b63614acf866cfd0e89da5f234
     diff-start: 12.0.0
+  - version: yoga-eom
+    projects:
+      - repo: openstack/senlin
+        hash: 6129dcf21eaab752fc8c236a1548867940d89413
 branches:
   - name: stable/yoga
     location: 13.0.0.0rc1
+  - name: unmaintained/yoga
+    location: yoga-eom
 release-notes: https://docs.openstack.org/releasenotes/senlin/yoga.html