[trove] 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: Ic444671d8bc472fe745e04804ea399908dd7cfcc

deliverables/yoga/python-troveclient.yaml

@@ -11,7 +11,14 @@ releases:
     projects:
       - repo: openstack/python-troveclient
         hash: 60817623ccbbfd7b4eee5b24be6ac4d82e9c3e8e
+  - version: yoga-eom
+    projects:
+      - repo: openstack/python-troveclient
+        hash: dbffc2f78f167591b0066ec256b80ff02f48543c
 branches:
   - name: stable/yoga
     location: 7.2.0
-release-notes: https://docs.openstack.org/releasenotes/python-troveclient/yoga.html
+  - name: unmaintained/yoga
+    location: yoga-eom
+release-notes:
+  https://docs.openstack.org/releasenotes/python-troveclient/yoga.html

deliverables/yoga/trove-dashboard.yaml

@@ -19,7 +19,13 @@ releases:
     projects:
       - repo: openstack/trove-dashboard
         hash: 8aa63e73453b5953068e9b511cbd759d20f0a690
+  - version: yoga-eom
+    projects:
+      - repo: openstack/trove-dashboard
+        hash: e8d8432c63b59f9586283524aff95e3cb13d9f24
 branches:
   - name: stable/yoga
     location: 18.0.0.0rc1
+  - name: unmaintained/yoga
+    location: yoga-eom
 release-notes: https://docs.openstack.org/releasenotes/trove-dashboard/yoga.html

deliverables/yoga/trove.yaml

@@ -23,7 +23,13 @@ releases:
     projects:
       - repo: openstack/trove
         hash: f07e85ded52abe31eaad6340d07f0d16c0a40c33
+  - version: yoga-eom
+    projects:
+      - repo: openstack/trove
+        hash: 29e54a6e1fce836fc5a44f305acdee8020f6e065
 branches:
   - name: stable/yoga
     location: 17.0.0.0rc1
+  - name: unmaintained/yoga
+    location: yoga-eom
 release-notes: https://docs.openstack.org/releasenotes/trove/yoga.html