Update stable branch testing

Remove tests for unmaintained branches and add a new test for 2023.2
release.

Change-Id: I1e4593eadd9545ac1f3e0b1a272a9ac24516499b

.zuul.yaml

@@ -8,10 +8,9 @@
       jobs:
         - blazar-tempest-plugin-base
         - blazar-tempest-plugin-ipv6-only
+        - blazar-tempest-plugin-2023-2
         - blazar-tempest-plugin-2023-1
         - blazar-tempest-plugin-zed
-        - blazar-tempest-plugin-yoga
-        - blazar-tempest-plugin-xena
     gate:
       jobs:
         - blazar-tempest-plugin-base
@@ -65,6 +64,12 @@
       - ^doc/.*$
       - ^releasenotes/.*$
 
+- job:
+    name: blazar-tempest-plugin-2023-2
+    parent: blazar-tempest-plugin-base
+    nodeset: openstack-single-node-jammy
+    override-checkout: stable/2023.2
+
 - job:
     name: blazar-tempest-plugin-2023-1
     parent: blazar-tempest-plugin-base
@@ -76,15 +81,3 @@
     parent: blazar-tempest-plugin-base
     nodeset: openstack-single-node-focal
     override-checkout: stable/zed
-
-- job:
-    name: blazar-tempest-plugin-yoga
-    parent: blazar-tempest-plugin-base
-    nodeset: openstack-single-node-focal
-    override-checkout: stable/yoga
-
-- job:
-    name: blazar-tempest-plugin-xena
-    parent: blazar-tempest-plugin-base
-    nodeset: openstack-single-node-focal
-    override-checkout: stable/xena