[octavia] 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: I5d2a68621e925cd7abee20dcfb6a7110282a773b

deliverables/zed/octavia-dashboard.yaml

@@ -21,7 +21,13 @@ releases:
     projects:
       - repo: openstack/octavia-dashboard
         hash: bd1a329b46d18baa42a9ba48d8031549a97a7bf2
+  - version: zed-eom
+    projects:
+      - repo: openstack/octavia-dashboard
+        hash: bd1a329b46d18baa42a9ba48d8031549a97a7bf2
 branches:
   - name: stable/zed
     location: 10.0.0.0rc1
+  - name: unmaintained/zed
+    location: zed-eom
 release-notes: https://docs.openstack.org/releasenotes/octavia-dashboard/zed.html

deliverables/zed/octavia-lib.yaml

@@ -20,7 +20,13 @@ releases:
     projects:
       - repo: openstack/octavia-lib
         hash: 3f764c5d2b17568aebc5a551de08f9d489d62519
+  - version: zed-eom
+    projects:
+      - repo: openstack/octavia-lib
+        hash: 3f764c5d2b17568aebc5a551de08f9d489d62519
 branches:
   - name: stable/zed
     location: 3.1.0
+  - name: unmaintained/zed
+    location: zed-eom
 release-notes: https://docs.openstack.org/releasenotes/octavia-lib/zed.html

deliverables/zed/octavia.yaml

@@ -38,7 +38,13 @@ releases:
     projects:
       - repo: openstack/octavia
         hash: d593976c339a7bea79a8e2f7c1949a3c105411c0
+  - version: zed-eom
+    projects:
+      - repo: openstack/octavia
+        hash: d593976c339a7bea79a8e2f7c1949a3c105411c0
 branches:
   - name: stable/zed
     location: 11.0.0.0rc1
+  - name: unmaintained/zed
+    location: zed-eom
 release-notes: https://docs.openstack.org/releasenotes/octavia/zed.html

deliverables/zed/python-octaviaclient.yaml

@@ -19,8 +19,14 @@ releases:
     projects:
       - repo: openstack/python-octaviaclient
         hash: c2522501c3fd90cddfdb5913b525be3d9dfdf5c4
+  - version: zed-eom
+    projects:
+      - repo: openstack/python-octaviaclient
+        hash: c2522501c3fd90cddfdb5913b525be3d9dfdf5c4
 branches:
   - name: stable/zed
     location: 3.1.0
+  - name: unmaintained/zed
+    location: zed-eom
 release-notes:
   https://docs.openstack.org/releasenotes/python-octaviaclient/zed.html