[trove] 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: I6e7748b2c330e46b99d0f5d8a5b6e26124024ad9

deliverables/stein/python-troveclient.yaml

@@ -19,6 +19,10 @@ releases:
     projects:
       - repo: openstack/python-troveclient
         hash: c3d667971d7c48cd6e069851252e494962fc251a
+  - version: stein-eol
+    projects:
+      - repo: openstack/python-troveclient
+        hash: c3d667971d7c48cd6e069851252e494962fc251a
 branches:
   - location: 2.17.0
     name: stable/stein

deliverables/stein/trove-dashboard.yaml

@@ -19,6 +19,10 @@ releases:
     projects:
       - repo: openstack/trove-dashboard
         hash: cc11fc13ee1d1a1688031de9145025afe06ccbce
+  - version: stein-eol
+    projects:
+      - repo: openstack/trove-dashboard
+        hash: ebb414093c2ccd0ef1a650f5110cac5d29934462
 branches:
   - location: 12.0.0.0rc1
     name: stable/stein

deliverables/stein/trove.yaml

@@ -19,6 +19,10 @@ releases:
     projects:
       - repo: openstack/trove
         hash: 75784f94b1411a325ab3bdff4c71d2e5aa2abc2b
+  - version: stein-eol
+    projects:
+      - repo: openstack/trove
+        hash: 169258a1c8e58e9eb771706ed054089b3a0b47a0
 branches:
   - location: 11.0.0.0rc1
     name: stable/stein