[OpenStackAnsible] Transition EM branches to Unmaintained

With the new TC resolution the community replaces Extended Maintenance
with Unmaintained status [1].

So this patch transitions victoria, wallaby, and xena EM branches to
Unmaintained as follows:
- tip of the given branch will be tagged with <series>-eom tag
- unmaintained/<series> branch will be cut from <series>-eom tag
- stable/<series> branch will be deleted

Some further notes:
- stable policy still applies
- backports can be pushed against unmaintained/<series> branch
- openstack-unmaintained-core group 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: Icdf1ab58449944326e68f2211c6f72c984a2a499

deliverables/victoria/openstack-ansible.yaml

@@ -97,7 +97,14 @@ releases:
     projects:
       - repo: openstack/openstack-ansible
         hash: 08d90900f01ec25f624ea7bfb31b2a7a58fdb8db
+  - version: victoria-eom
+    projects:
+      - repo: openstack/openstack-ansible
+        hash: dc728b77a888a61deb61bcb28d5a68fdd0163011
 branches:
   - name: stable/victoria
     location: 22.0.0.0rc1
-release-notes: https://docs.openstack.org/releasenotes/openstack-ansible/victoria.html
+  - name: unmaintained/victoria
+    location: victoria-eom
+release-notes:
+  https://docs.openstack.org/releasenotes/openstack-ansible/victoria.html

deliverables/wallaby/openstack-ansible.yaml

@@ -90,7 +90,14 @@ releases:
     projects:
       - repo: openstack/openstack-ansible
         hash: 91f0009dcbd45e0828f6d47e70930c524b37fc5d
+  - version: wallaby-eom
+    projects:
+      - repo: openstack/openstack-ansible
+        hash: 4e9061ea09abc120f3a72988d1d77b9daa27f79f
 branches:
   - name: stable/wallaby
     location: 23.0.0.0rc1
-release-notes: https://docs.openstack.org/releasenotes/openstack-ansible/wallaby.html
+  - name: unmaintained/wallaby
+    location: wallaby-eom
+release-notes:
+  https://docs.openstack.org/releasenotes/openstack-ansible/wallaby.html

deliverables/xena/openstack-ansible.yaml

@@ -76,7 +76,14 @@ releases:
     projects:
       - repo: openstack/openstack-ansible
         hash: e1522c27907c6aa6dbe68a831791cd45fb01dac4
+  - version: xena-eom
+    projects:
+      - repo: openstack/openstack-ansible
+        hash: b998cd9652169dd3f2dbbebfb92f22f091d593b5
 branches:
   - name: stable/xena
     location: 24.0.0.0rc1
-release-notes: https://docs.openstack.org/releasenotes/openstack-ansible/xena.html
+  - name: unmaintained/xena
+    location: xena-eom
+release-notes:
+  https://docs.openstack.org/releasenotes/openstack-ansible/xena.html