[Tempest Plugins] Tag stein-last

Stein branch is in Extended Maintenance now[1]. All Tempest
plugins are branchless which means master version of Tempest
and its plugins is used to test the supported stable branches.

Once stable branch is moved to EM state then, Tempest and its
plugins compatible tag needs to be released so that we can
keep testing the EM stable branches with this tag once master
Tempest and its plugins are not compatible[2].

This tag will help for testing the stable/stein with single
compatible tag of Tempest and its plugins.

Tagging 'stein-last' as well as a new version also with same hash.
Documenting this new tag name here
- https://review.opendev.org/c/openstack/project-team-guide/+/769821

More detail on compatible version policy for Tempest and its
plugins is here
- https://docs.openstack.org/tempest/latest/tempest_and_plugins_compatible_version_policy.html

[1] https://releases.openstack.org/stein/index.html
[2] https://docs.openstack.org/tempest/latest/stable_branch_support_policy.html

Change-Id: I20303de64ae1e1c0448583819ade37ba928f8f3b

deliverables/stein/trove-tempest-plugin.yaml

@@ -13,3 +13,7 @@ releases:
       - hash: 45b175df17df68ae97ce9b07e99d8a74ee76915d
         repo: openstack/trove-tempest-plugin
     version: 0.2.0
+  - version: stein-last
+    projects:
+      - repo: openstack/trove-tempest-plugin
+        hash: 355a351fccb286bf7d9025829e5362a4f0f6a223

deliverables/wallaby/trove-tempest-plugin.yaml

@@ -9,3 +9,8 @@ repository-settings:
     tarball-base: trove_tempest_plugin
 team: trove
 type: tempest-plugin
+releases:
+  - version: 1.2.0
+    projects:
+      - repo: openstack/trove-tempest-plugin
+        hash: 355a351fccb286bf7d9025829e5362a4f0f6a223