[Release Management] Transition 2024.1 Caracal to Unmaintained

This branch reached the end of its official stable maintained period,
hence this patch transition stable/2024.1 branch to Unmaintained. (For
details about Unmaintained state please see: [1][2])

The transitions is as follows:
- tip of the stable/2024.1 branch is tagged with 2024.1-eom tag
- unmaintained/2024.1 branch will be cut from 2024.1-eom tag
- stable/2024.1 branch will be deleted

Note:
- there will no longer be official releases off of 2024.1 branch after
  this transition
- backports can be pushed to unmaintained/2024.1 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 2024.1 Caracal stable release
with backports currently in flight that we should wait for. For the
latter case, please propose a final 2024.1 Caracal stable release
patch, and rebase this patch on top of that, with the latest commit
hash of stable/2024.1.

The planned transition deadline is October 24th, 2025 [3] last week,
so please approve this patch as soon as possible if the project is
ready for the transition.

[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: I0b57d54f3ab268f320cd95abd1e4623f757e8931
Signed-off-by: Előd Illés <elod.illes@est.tech>
Generated-By: openstack/releases:tools/bulk_review.sh

deliverables/caracal/release-test.yaml

@@ -16,6 +16,12 @@ releases:
     projects:
       - repo: openstack/release-test
         hash: 3bb6e745e210c822a3e7cf04ebab61e339229f37
+  - version: 2024.1-eom
+    projects:
+      - repo: openstack/release-test
+        hash: 0621d31ab6f191211bdf8139c34b5ba6d2177ac2
 branches:
   - name: stable/2024.1
     location: 6.0.0
+  - name: unmaintained/2024.1
+    location: 2024.1-eom