[kuryr] 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: I9c78720179b2bab3f8a363589b946a56fde0ab38

deliverables/yoga/kuryr-kubernetes.yaml

@@ -24,7 +24,13 @@ releases:
     projects:
       - repo: openstack/kuryr-kubernetes
         hash: f51aa74b2a1864765c981d64188b3054f7e41ab3
+  - version: yoga-eom
+    projects:
+      - repo: openstack/kuryr-kubernetes
+        hash: f51aa74b2a1864765c981d64188b3054f7e41ab3
 branches:
   - name: stable/yoga
     location: 6.0.0.0rc1
+  - name: unmaintained/yoga
+    location: yoga-eom
 release-notes: https://docs.openstack.org/releasenotes/kuryr-kubernetes/yoga.html

deliverables/yoga/kuryr-libnetwork.yaml

@@ -15,7 +15,13 @@ releases:
       - repo: openstack/kuryr-libnetwork
         hash: e5daefc3c2dae2d4f65ef584eb257e841cd417e7
     diff-start: 8.0.0
+  - version: yoga-eom
+    projects:
+      - repo: openstack/kuryr-libnetwork
+        hash: 49078002d6575ec6ba4121c3b3fe8d6517ba36e3
 branches:
   - name: stable/yoga
     location: 9.0.0.0rc1
+  - name: unmaintained/yoga
+    location: yoga-eom
 release-notes: https://docs.openstack.org/releasenotes/kuryr-libnetwork/yoga.html

deliverables/yoga/kuryr.yaml

@@ -11,7 +11,13 @@ releases:
     projects:
       - repo: openstack/kuryr
         hash: 5b38e84ef8a0a62ee44d53ddd1cda377b0d9d934
+  - version: yoga-eom
+    projects:
+      - repo: openstack/kuryr
+        hash: d8cb765e69ee26fcd6293a5871093fb2397d96de
 branches:
   - name: stable/yoga
     location: 2.5.0
+  - name: unmaintained/yoga
+    location: yoga-eom
 release-notes: https://docs.openstack.org/releasenotes/kuryr/yoga.html