[telemetry-tempest-plugin] Tag xena-last

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

Once any stable branch is moved to EM state then, Tempest and
its plugins compatible tag[2] needs to be released so that we can
keep testing the EM stable branches with that tag once master
Tempest and its plugins are not compatible[3].

Tagging 'xena-last' as well as a new version also with same hash.

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

Change-Id: I74005d313f0fe2b6f07499f56fc2a140ba341b97

deliverables/bobcat/telemetry-tempest-plugin.yaml

@@ -9,3 +9,8 @@ repository-settings:
     tarball-base: telemetry_tempest_plugin
 team: Telemetry
 type: tempest-plugin
+releases:
+  - version: 1.10.0
+    projects:
+      - repo: openstack/telemetry-tempest-plugin
+        hash: 2064db7dc70b7167d3016d5eef092031733d6e94

deliverables/xena/telemetry-tempest-plugin.yaml

@@ -18,3 +18,7 @@ releases:
     projects:
       - repo: openstack/telemetry-tempest-plugin
         hash: c410268ab1410de6baf035a66f9fcfaa2e6f5c18
+  - version: xena-last
+    projects:
+      - repo: openstack/telemetry-tempest-plugin
+        hash: 2064db7dc70b7167d3016d5eef092031733d6e94