[kuryr] 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: I567424c888f226e0376ab6700984f5da80c8d648

deliverables/zed/kuryr-kubernetes.yaml

@@ -15,7 +15,13 @@ releases:
       - repo: openstack/kuryr-kubernetes
         hash: 0df1f9176bcd9c46dc706c395140ea02d015cf1b
     diff-start: 6.0.0
+  - version: zed-eom
+    projects:
+      - repo: openstack/kuryr-kubernetes
+        hash: 7fbc04c09080049ad24e9d4696d9fe209ad10e99
 branches:
   - name: stable/zed
     location: 7.0.0.0rc1
+  - name: unmaintained/zed
+    location: zed-eom
 release-notes: https://docs.openstack.org/releasenotes/kuryr-kubernetes/zed.html

deliverables/zed/kuryr-libnetwork.yaml

@@ -15,7 +15,13 @@ releases:
       - repo: openstack/kuryr-libnetwork
         hash: aac61e7cbf2f4ff3310635362ef49de48efa6494
     diff-start: 9.0.0
+  - version: zed-eom
+    projects:
+      - repo: openstack/kuryr-libnetwork
+        hash: fe70d29f56867a9c4b12156b1cfb5c5ec47d0dc2
 branches:
   - name: stable/zed
     location: 10.0.0.0rc1
+  - name: unmaintained/zed
+    location: zed-eom
 release-notes: https://docs.openstack.org/releasenotes/kuryr-libnetwork/zed.html

deliverables/zed/kuryr.yaml

@@ -11,7 +11,13 @@ releases:
     projects:
       - repo: openstack/kuryr
         hash: 415a54249b6ff83932428d9957ab889678c13455
+  - version: zed-eom
+    projects:
+      - repo: openstack/kuryr
+        hash: 2719d659d97e57929752a4cc9757d79894afd06f
 branches:
   - name: stable/zed
     location: 2.6.0
+  - name: unmaintained/zed
+    location: zed-eom
 release-notes: https://docs.openstack.org/releasenotes/kuryr/zed.html