[Quality Assurance] 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: I4cf2f3b8df6a0d3de1a216a0e67088cccb7f34a9

deliverables/yoga/devstack-plugin-ceph.yaml

@@ -8,5 +8,12 @@ branches:
   - location:
       openstack/devstack-plugin-ceph: b0418e177f6d6059063dd1da2e1a3d228b83b309
     name: stable/yoga
+  - name: unmaintained/yoga
+    location: yoga-eom
 repository-settings:
   openstack/devstack-plugin-ceph: {}
+releases:
+  - version: yoga-eom
+    projects:
+      - repo: openstack/devstack-plugin-ceph
+        hash: 4b81ab92438d7d204c7090e9b64bcf00ae1229ee

deliverables/yoga/devstack-plugin-container.yaml

@@ -8,5 +8,12 @@ branches:
   - location:
       openstack/devstack-plugin-container: 47599355271a24d903ff4f70a794b17f97360fec
     name: stable/yoga
+  - name: unmaintained/yoga
+    location: yoga-eom
 repository-settings:
   openstack/devstack-plugin-container: {}
+releases:
+  - version: yoga-eom
+    projects:
+      - repo: openstack/devstack-plugin-container
+        hash: 53e3388873b95e2c23a4d43d7d48668d4ac81b5e

deliverables/yoga/devstack.yaml

@@ -8,5 +8,12 @@ branches:
   - location:
       openstack/devstack: a9d392cdbbe22b90400b1029d35f1285aaba455c
     name: stable/yoga
+  - name: unmaintained/yoga
+    location: yoga-eom
 repository-settings:
   openstack/devstack: {}
+releases:
+  - version: yoga-eom
+    projects:
+      - repo: openstack/devstack
+        hash: eb076e8871d9ad0c7fd83b57df6a26f95a4648e0

deliverables/yoga/grenade.yaml

@@ -8,5 +8,12 @@ branches:
   - location:
       openstack/grenade: 9b223d3e22f2078cce7972ce65fe19e5c3323f6b
     name: stable/yoga
+  - name: unmaintained/yoga
+    location: yoga-eom
 repository-settings:
   openstack/grenade: {}
+releases:
+  - version: yoga-eom
+    projects:
+      - repo: openstack/grenade
+        hash: fd4ded5792bd66fe29eeccb36bd69dbd3f9bfe43