[cyborg] 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: Idb2b6a1b54372cd4d9ffb51c536a7dc371db91ce

deliverables/stein/cyborg.yaml

@@ -26,6 +26,10 @@ releases:
     projects:
       - repo: openstack/cyborg
         hash: 0160a6b3bbcd94c479780e71510bee5fc16b5df7
+  - version: stein-eol
+    projects:
+      - repo: openstack/cyborg
+        hash: 43425c5839f22a30c75226692d7d1278117703bf
 cycle-highlights:
   - Add FPGA programming support
   - Add GPU drivers

deliverables/stein/os-acc.yaml

@@ -16,6 +16,10 @@ releases:
     projects:
       - repo: openstack/os-acc
         hash: 0506812fff952bf8df0942cbe7d45a07d464ec38
+  - version: stein-eol
+    projects:
+      - repo: openstack/os-acc
+        hash: a78513033bb185aa4817817fb83b8126bf41b990
 branches:
   - location: 0.2.0
     name: stable/stein

deliverables/stein/python-cyborgclient.yaml

@@ -21,3 +21,7 @@ releases:
     projects:
       - repo: openstack/python-cyborgclient
         hash: dfe15c51b7d1660b3bad055b067e4c2f4a1af2fe
+  - version: stein-eol
+    projects:
+      - repo: openstack/python-cyborgclient
+        hash: 641a7492d870f8913768c0b74c6ddfdae6aac62e