[glance] 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: I5fc5e039d0910bf3f3362c78c0a9f5c968ac5509

deliverables/stein/glance-store.yaml

@@ -23,6 +23,10 @@ releases:
     projects:
       - repo: openstack/glance_store
         hash: 27e421af26cd1bcc68746a0beadb541fb8d647be
+  - version: stein-eol
+    projects:
+      - repo: openstack/glance_store
+        hash: 27e421af26cd1bcc68746a0beadb541fb8d647be
 branches:
   - location: 0.28.0
     name: stable/stein

deliverables/stein/glance.yaml

@@ -35,4 +35,8 @@ releases:
     projects:
       - repo: openstack/glance
         hash: 149ea050cc58f39eaf9b4660bb8f0271b99d03da
+  - version: stein-eol
+    projects:
+      - repo: openstack/glance
+        hash: 149ea050cc58f39eaf9b4660bb8f0271b99d03da
 release-notes: https://docs.openstack.org/releasenotes/glance/stein.html

deliverables/stein/python-glanceclient.yaml

@@ -23,7 +23,12 @@ releases:
     projects:
       - repo: openstack/python-glanceclient
         hash: 44a4dbd6ce2642daeaca9f45ac99e2d1b39e805a
+  - version: stein-eol
+    projects:
+      - repo: openstack/python-glanceclient
+        hash: 4993b46d179d4e1c38fc4456a98e38c007385ce6
 branches:
   - location: 2.16.0
     name: stable/stein
-release-notes: https://docs.openstack.org/releasenotes/python-glanceclient/stein.html
+release-notes: 
+  https://docs.openstack.org/releasenotes/python-glanceclient/stein.html