[cinder] 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: I99a8120217aad06f1d3daea96f0cb07389fcfb68

deliverables/yoga/cinder.yaml

@@ -64,7 +64,13 @@ releases:
     projects:
       - repo: openstack/cinder
         hash: f6d69ab251f212c8b6a0f2f26cda619ffa67b71a
+  - version: yoga-eom
+    projects:
+      - repo: openstack/cinder
+        hash: f6d69ab251f212c8b6a0f2f26cda619ffa67b71a
 branches:
   - name: stable/yoga
     location: 20.0.0.0rc1
+  - name: unmaintained/yoga
+    location: yoga-eom
 release-notes: https://docs.openstack.org/releasenotes/cinder/yoga.html

deliverables/yoga/cinderlib.yaml

@@ -10,7 +10,13 @@ releases:
     projects:
       - repo: openstack/cinderlib
         hash: 7be24a5578c0eb94f5f1de21c2cfb02c43043e53
+  - version: yoga-eom
+    projects:
+      - repo: openstack/cinderlib
+        hash: 4f8a6a5e6200e0f84b4bc4bf96487e8b65d97edc
 branches:
   - name: stable/yoga
     location: 4.2.0
+  - name: unmaintained/yoga
+    location: yoga-eom
 release-notes: https://docs.openstack.org/releasenotes/cinderlib/yoga.html

deliverables/yoga/os-brick.yaml

@@ -31,7 +31,13 @@ releases:
     projects:
       - repo: openstack/os-brick
         hash: e57201a2843c2dd9cc6744cb8148dd6e3ed8f52f
+  - version: yoga-eom
+    projects:
+      - repo: openstack/os-brick
+        hash: 994cfb3f38b7481c8bf06a615bd9959f93bbd142
 branches:
   - location: 5.2.0
     name: stable/yoga
+  - name: unmaintained/yoga
+    location: yoga-eom
 release-notes: https://docs.openstack.org/releasenotes/os-brick/yoga.html

deliverables/yoga/python-brick-cinderclient-ext.yaml

@@ -11,7 +11,14 @@ releases:
     projects:
       - repo: openstack/python-brick-cinderclient-ext
         hash: 0c89994666a0774893ff8df2bfb50a54d37fca6a
+  - version: yoga-eom
+    projects:
+      - repo: openstack/python-brick-cinderclient-ext
+        hash: f825b5ba738e4ce898e34645244acd315afd492f
 branches:
   - location: 1.5.0
     name: stable/yoga
-release-notes: https://docs.openstack.org/releasenotes/python-brick-cinderclient-ext/yoga.html
+  - name: unmaintained/yoga
+    location: yoga-eom
+release-notes:
+  https://docs.openstack.org/releasenotes/python-brick-cinderclient-ext/yoga.html

deliverables/yoga/python-cinderclient.yaml

@@ -15,7 +15,14 @@ releases:
     projects:
       - repo: openstack/python-cinderclient
         hash: ee59b68d717b871d034139bbb9c3546e4b17d950
+  - version: yoga-eom
+    projects:
+      - repo: openstack/python-cinderclient
+        hash: b80d1e6a2afe9ccea7d28ac9974112c1768463df
 branches:
   - name: stable/yoga
     location: 8.3.0
-release-notes: https://docs.openstack.org/releasenotes/python-cinderclient/yoga.html
+  - name: unmaintained/yoga
+    location: yoga-eom
+release-notes:
+  https://docs.openstack.org/releasenotes/python-cinderclient/yoga.html