[searchlight] 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: Iade332a528f8d39c06e88be9c1e233532202bf99

deliverables/stein/python-searchlightclient.yaml

@@ -19,6 +19,10 @@ releases:
     projects:
       - repo: openstack/python-searchlightclient
         hash: d363f6ba6b3820c41eac033dc151f69fe24a278c
+  - version: stein-eol
+    projects:
+      - repo: openstack/python-searchlightclient
+        hash: 557faaddc0b69d53e8438210679514a0e19d3f3f
 team: searchlight
 type: client-library
 repository-settings:

deliverables/stein/searchlight-ui.yaml

@@ -28,6 +28,10 @@ releases:
     projects:
       - repo: openstack/searchlight-ui
         hash: ee2e37107bf6da33133b15b410edb48f9f459f58
+  - version: stein-eol
+    projects:
+      - repo: openstack/searchlight-ui
+        hash: be298d3620d112369b74fca426bdc54868b675d9
 team: searchlight
 type: horizon-plugin
 repository-settings:

deliverables/stein/searchlight.yaml

@@ -27,6 +27,10 @@ releases:
     projects:
       - repo: openstack/searchlight
         hash: acd19c3559a83582b438757adb2b6408710dbdb8
+  - version: stein-eol
+    projects:
+      - repo: openstack/searchlight
+        hash: ca7ade1104cd127b7c156b27a64b270116b66b13
 team: searchlight
 type: service
 repository-settings: