[cinder] 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: Icbf48bd4adb8407bb7b2e4612b071fc18d5d23ac

deliverables/zed/cinder.yaml

@@ -55,7 +55,13 @@ releases:
     projects:
       - repo: openstack/cinder
         hash: bd2d192c6b76961ec665d922694a21b1f38a0f16
+  - version: zed-eom
+    projects:
+      - repo: openstack/cinder
+        hash: f74e2729554bee01b0a3e631a8001bb39e540433
 branches:
   - name: stable/zed
     location: 21.0.0.0rc1
+  - name: unmaintained/zed
+    location: zed-eom
 release-notes: https://docs.openstack.org/releasenotes/cinder/zed.html

deliverables/zed/cinderlib.yaml

@@ -10,7 +10,13 @@ releases:
     projects:
       - repo: openstack/cinderlib
         hash: 3356e71cb9d13da1d59b6bcd5d63668965623301
+  - version: zed-eom
+    projects:
+      - repo: openstack/cinderlib
+        hash: df4ca29933debba232ab70992362d7a31b3b35e9
 branches:
   - name: stable/zed
     location: 5.0.0
+  - name: unmaintained/zed
+    location: zed-eom
 release-notes: https://docs.openstack.org/releasenotes/cinderlib/zed.html

deliverables/zed/os-brick.yaml

@@ -23,7 +23,13 @@ releases:
     projects:
       - repo: openstack/os-brick
         hash: 8282b14889872d48ccc49312cb0901773b914c38
+  - version: zed-eom
+    projects:
+      - repo: openstack/os-brick
+        hash: a6212f5bf1170a002291afc0427eb44b1f2801aa
 branches:
   - name: stable/zed
     location: 6.1.0
+  - name: unmaintained/zed
+    location: zed-eom
 release-notes: https://docs.openstack.org/releasenotes/os-brick/zed.html

deliverables/zed/python-brick-cinderclient-ext.yaml

@@ -11,7 +11,14 @@ releases:
     projects:
       - repo: openstack/python-brick-cinderclient-ext
         hash: 6a1c4736a6ca6a8dfc66a585b2b418bb9789c327
+  - version: zed-eom
+    projects:
+      - repo: openstack/python-brick-cinderclient-ext
+        hash: 185b24534f0edb4a85feb12812459873ddc1195d
 branches:
   - name: stable/zed
     location: 2.0.0
-release-notes: https://docs.openstack.org/releasenotes/python-brick-cinderclient-ext/zed.html
+  - name: unmaintained/zed
+    location: zed-eom
+release-notes:
+  https://docs.openstack.org/releasenotes/python-brick-cinderclient-ext/zed.html

deliverables/zed/python-cinderclient.yaml

@@ -19,7 +19,14 @@ releases:
     projects:
       - repo: openstack/python-cinderclient
         hash: 22a3169576b3fd91388e7b57ffd39e3760016796
+  - version: zed-eom
+    projects:
+      - repo: openstack/python-cinderclient
+        hash: 22a3169576b3fd91388e7b57ffd39e3760016796
 branches:
   - name: stable/zed
     location: 9.1.0
-release-notes: https://docs.openstack.org/releasenotes/python-cinderclient/zed.html
+  - name: unmaintained/zed
+    location: zed-eom
+release-notes:
+  https://docs.openstack.org/releasenotes/python-cinderclient/zed.html