[tacker] Transition Stein to End of Life

As announced on mailing list [1], this patch transitions the Stein
branch to End of Life. The last patch of the branch will be tagged with
stein-eol tag. stable/stein branch cannot be used anymore and will be
deleted if this patch merges.

This is needed as stable/stein is not actively maintained in recent
period, thus gates are mostly broken due to job failures. Besides,
by removing these branches, infra resources will be freed up, too.

Please try to identify any zuul job, that is defined outside of the
repositories in this patch (for example in openstack-zuul-jobs, etc.)
and won't be used anymore if stable/stein is deleted. Propose a job
removal patch for them.

Please +1 if the team is ready for us to proceed with this transition,
or -1 if there are still some activity on the branch and the team wants
to continue to maintain it.

[1] https://lists.openstack.org/pipermail/openstack-discuss/2023-September/034965.html

Change-Id: I63afa8e9c6deaf78fea679d9dbd65c14ddaa249e

deliverables/stein/python-tackerclient.yaml

@@ -13,9 +13,14 @@ releases:
     projects:
       - repo: openstack/python-tackerclient
         hash: f4839f308ab341bbb4a8faa818b0d6eba2048819
+  - version: stein-eol
+    projects:
+      - repo: openstack/python-tackerclient
+        hash: a09a263119977deaf563a255a00df36f71f91d6e
 repository-settings:
   openstack/python-tackerclient: {}
 branches:
   - location: 0.15.0
     name: stable/stein
-release-notes: https://docs.openstack.org/releasenotes/python-tackerclient/stein.html
+release-notes: 
+  https://docs.openstack.org/releasenotes/python-tackerclient/stein.html

deliverables/stein/tacker-horizon.yaml

@@ -20,6 +20,10 @@ releases:
     projects:
       - repo: openstack/tacker-horizon
         hash: 471af9fd63ea5152ad7110e8e7717f6260a63ec4
+  - version: stein-eol
+    projects:
+      - repo: openstack/tacker-horizon
+        hash: 471af9fd63ea5152ad7110e8e7717f6260a63ec4
 repository-settings:
   openstack/tacker-horizon: {}
 branches:

deliverables/stein/tacker.yaml

@@ -27,6 +27,10 @@ releases:
     projects:
       - repo: openstack/tacker
         hash: aee46c86bbe87cbb8b6ebb3bd9b765aafd13df53
+  - version: stein-eol
+    projects:
+      - repo: openstack/tacker
+        hash: aee46c86bbe87cbb8b6ebb3bd9b765aafd13df53
 branches:
   - location: 1.0.0.0rc1
     name: stable/stein