[vitrage] 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: I4510a37e9a3a41537500e957ccca7d1a741126ec

deliverables/yoga/python-vitrageclient.yaml

@@ -11,7 +11,14 @@ releases:
     projects:
       - repo: openstack/python-vitrageclient
         hash: cb9d0ee604f96e59f5018b5a59e3be07f73214cd
+  - version: yoga-eom
+    projects:
+      - repo: openstack/python-vitrageclient
+        hash: 996da029c2f814fce779152a192287619db56dd0
 branches:
   - name: stable/yoga
     location: 4.5.0
-release-notes: https://docs.openstack.org/releasenotes/python-vitrageclient/yoga.html
+  - name: unmaintained/yoga
+    location: yoga-eom
+release-notes:
+  https://docs.openstack.org/releasenotes/python-vitrageclient/yoga.html

deliverables/yoga/vitrage-dashboard.yaml

@@ -10,7 +10,14 @@ releases:
     projects:
       - repo: openstack/vitrage-dashboard
         hash: eb6e8c1deb33d11d65926e040ddc96a814960c7d
+  - version: yoga-eom
+    projects:
+      - repo: openstack/vitrage-dashboard
+        hash: 7dced3895a298ba6fa653409cc8bf7444c20c125
 branches:
   - name: stable/yoga
     location: 3.5.0
-release-notes: https://docs.openstack.org/releasenotes/vitrage-dashboard/yoga.html
+  - name: unmaintained/yoga
+    location: yoga-eom
+release-notes:
+  https://docs.openstack.org/releasenotes/vitrage-dashboard/yoga.html

deliverables/yoga/vitrage.yaml

@@ -14,7 +14,13 @@ releases:
     projects:
       - repo: openstack/vitrage
         hash: b887e0f3525d494e6e2b08516e0244bbe96976d6
+  - version: yoga-eom
+    projects:
+      - repo: openstack/vitrage
+        hash: c3c1e8463c61b0e11b4012ccade35beb8208ee64
 branches:
   - name: stable/yoga
     location: 8.0.0
+  - name: unmaintained/yoga
+    location: yoga-eom
 release-notes: https://docs.openstack.org/releasenotes/vitrage/yoga.html