[nova] 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: Icff9fb4bde3d6dddba476ad01991c7dc8f7a2113

deliverables/yoga/nova.yaml

@@ -65,7 +65,13 @@ releases:
     projects:
       - repo: openstack/nova
         hash: 5ec73eb2768a628089fd54968b19fa5382c6df38
+  - version: yoga-eom
+    projects:
+      - repo: openstack/nova
+        hash: 5ec73eb2768a628089fd54968b19fa5382c6df38
 branches:
   - name: stable/yoga
     location: 25.0.0.0rc1
+  - name: unmaintained/yoga
+    location: yoga-eom
 release-notes: https://docs.openstack.org/releasenotes/nova/yoga.html

deliverables/yoga/os-vif.yaml

@@ -20,7 +20,13 @@ releases:
     projects:
       - repo: openstack/os-vif
         hash: cf9c15d034b534e50b456a8a2f6b6a4d5b89a24b
+  - version: yoga-eom
+    projects:
+      - repo: openstack/os-vif
+        hash: cf9c15d034b534e50b456a8a2f6b6a4d5b89a24b
 branches:
   - name: stable/yoga
     location: 2.7.1
+  - name: unmaintained/yoga
+    location: yoga-eom
 release-notes: https://docs.openstack.org/releasenotes/os-vif/yoga.html

deliverables/yoga/osc-placement.yaml

@@ -11,7 +11,13 @@ releases:
     projects:
       - repo: openstack/osc-placement
         hash: 73e496ff6cde291bb9cd2d42c64cb3b4c7afdf8a
+  - version: yoga-eom
+    projects:
+      - repo: openstack/osc-placement
+        hash: d2c170d778c7aadccae602b9e7e95144b9d888ad
 branches:
   - name: stable/yoga
     location: 3.2.0
+  - name: unmaintained/yoga
+    location: yoga-eom
 release-notes: https://docs.openstack.org/releasenotes/osc-placement/yoga.html

deliverables/yoga/placement.yaml

@@ -17,7 +17,13 @@ releases:
       - repo: openstack/placement
         hash: ff0f2dda7755dfee15af353348bd121e0965fa8c
     diff-start: 6.0.0.0rc1
+  - version: yoga-eom
+    projects:
+      - repo: openstack/placement
+        hash: 4d3df47ee3e394e3178d58c15306620809ad2806
 branches:
   - name: stable/yoga
     location: 7.0.0.0rc1
+  - name: unmaintained/yoga
+    location: yoga-eom
 release-notes: https://docs.openstack.org/releasenotes/placement/yoga.html

deliverables/yoga/python-novaclient.yaml

@@ -11,7 +11,14 @@ releases:
     projects:
       - repo: openstack/python-novaclient
         hash: 63d368168c87bc0b9a9b7928b42553c609e46089
+  - version: yoga-eom
+    projects:
+      - repo: openstack/python-novaclient
+        hash: 79c21ab698055504567c45a31e18c7cc1eedf50b
 branches:
   - name: stable/yoga
     location: 17.7.0
-release-notes: https://docs.openstack.org/releasenotes/python-novaclient/yoga.html
+  - name: unmaintained/yoga
+    location: yoga-eom
+release-notes:
+  https://docs.openstack.org/releasenotes/python-novaclient/yoga.html