[blazar] 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: I82fa18598a84745942c950a75307182879195690

deliverables/yoga/blazar-dashboard.yaml

@@ -16,7 +16,13 @@ releases:
       - repo: openstack/blazar-dashboard
         hash: fb9ae6e2c21991ec682109d5202b664377ce5c59
     diff-start: 6.0.0
+  - version: yoga-eom
+    projects:
+      - repo: openstack/blazar-dashboard
+        hash: 1412bd666e47caf3b2f8a28bf7ffd594efe9fd4f
 branches:
   - name: stable/yoga
     location: 7.0.0.0rc1
+  - name: unmaintained/yoga
+    location: yoga-eom
 release-notes: https://docs.openstack.org/releasenotes/blazar-dashboard/yoga.html

deliverables/yoga/blazar-nova.yaml

@@ -15,7 +15,13 @@ releases:
     projects:
       - repo: openstack/blazar-nova
         hash: e67b23cb9c0f6b958e72a3e9aa78d4a5ba98c5d8
+  - version: yoga-eom
+    projects:
+      - repo: openstack/blazar-nova
+        hash: f7a8f9c8076dc26936ce6ffaa2567f729c60d863
 branches:
   - name: stable/yoga
     location: 2.4.0
+  - name: unmaintained/yoga
+    location: yoga-eom
 release-notes: https://docs.openstack.org/releasenotes/blazar-nova/yoga.html

deliverables/yoga/blazar.yaml

@@ -21,7 +21,13 @@ releases:
       - repo: openstack/blazar
         hash: e9c19e2206839d4f73bb94aab579fbec596df8f4
     diff-start: 8.0.0
+  - version: yoga-eom
+    projects:
+      - repo: openstack/blazar
+        hash: def1eac07d3e2fbcc9f8f07f926f20f88ddea990
 branches:
   - name: stable/yoga
     location: 9.0.0.0rc1
+  - name: unmaintained/yoga
+    location: yoga-eom
 release-notes: https://docs.openstack.org/releasenotes/blazar/yoga.html

deliverables/yoga/python-blazarclient.yaml

@@ -15,7 +15,14 @@ releases:
     projects:
       - repo: openstack/python-blazarclient
         hash: cf8f802c946f243f70f20be8973503e8d194f482
+  - version: yoga-eom
+    projects:
+      - repo: openstack/python-blazarclient
+        hash: cf8f802c946f243f70f20be8973503e8d194f482
 branches:
   - name: stable/yoga
     location: 3.4.0
-release-notes: https://docs.openstack.org/releasenotes/python-blazarclient/yoga.html
+  - name: unmaintained/yoga
+    location: yoga-eom
+release-notes:
+  https://docs.openstack.org/releasenotes/python-blazarclient/yoga.html