[senlin] Transition Zed to Unmaintained

This branch reached the end of its official stable maintained period,
hence this patch transition stable/zed branch to Unmaintained. (For
details about Unmaintained state please see: [1][2])

The transitions is as follows:
- tip of the stable/zed branch is tagged with zed-eom tag
- unmaintained/zed branch will be cut from zed-eom tag
- stable/zed branch will be deleted

Note:
- there will no longer be official releases off of zed branch after this
  transition
- backports can be pushed to unmaintained/yoga branch
- openstack-unmaintained-core (or <project>-unmaintained-core groups if
  such exists) have the rights to merge patches

Important: please +1 if the team is ready for us to proceed with this
transition, or -1 if there are any final Zed stable release with
backports currently in flight that we should wait for. For the latter
case, please propose a final Zed stable release patch, and rebase this
patch on top of that, with the latest commit hash of stable/zed.

The transition deadline is May 2nd, 2024. [3]

[1] https://docs.openstack.org/project-team-guide/stable-branches.html#unmaintained
[2] https://governance.openstack.org/tc/resolutions/20230724-unmaintained-branches.html
[3] https://releases.openstack.org

Change-Id: I5c18aa1b66cf7bd751839760eeb9faefb3c7913e

deliverables/zed/python-senlinclient.yaml

@@ -11,7 +11,14 @@ releases:
     projects:
       - repo: openstack/python-senlinclient
         hash: c17a8c48f29d88dcd4e50254e31a7e70337a2139
+  - version: zed-eom
+    projects:
+      - repo: openstack/python-senlinclient
+        hash: 16ff6622338d595af0da6452e7489764cf19850f
 branches:
   - name: stable/zed
     location: 2.5.0
-release-notes: https://docs.openstack.org/releasenotes/python-senlinclient/zed.html
+  - name: unmaintained/zed
+    location: zed-eom
+release-notes:
+  https://docs.openstack.org/releasenotes/python-senlinclient/zed.html

deliverables/zed/senlin-dashboard.yaml

@@ -15,7 +15,13 @@ releases:
       - repo: openstack/senlin-dashboard
         hash: cecde61b17b1d35bdb667f0fd1f7e095d90764a9
     diff-start: 5.0.0
+  - version: zed-eom
+    projects:
+      - repo: openstack/senlin-dashboard
+        hash: 44d20522c05fea725d7d597b9498bfaeed189e38
 branches:
   - name: stable/zed
     location: 6.0.0.0rc1
+  - name: unmaintained/zed
+    location: zed-eom
 release-notes: https://docs.openstack.org/releasenotes/senlin-dashboard/zed.html

deliverables/zed/senlin.yaml

@@ -15,7 +15,13 @@ releases:
       - repo: openstack/senlin
         hash: 5d3bc56e01f163b62b6e5d53c53ec1bdcf792cc7
     diff-start: 13.0.0
+  - version: zed-eom
+    projects:
+      - repo: openstack/senlin
+        hash: b6ef17b0f787fb7a0609ba36dc13097882a6a3ff
 branches:
   - name: stable/zed
     location: 14.0.0.0rc1
+  - name: unmaintained/zed
+    location: zed-eom
 release-notes: https://docs.openstack.org/releasenotes/senlin/zed.html