Remove stable/victoria job and fixing job description

As we have pinned Tempest and cinder-temest-plugin in EM
stable/victoria, we do not need to test those in master
gate, so removing the stable/victoria job from master gate.

Also, fixing the comment about job description update from
- https://review.opendev.org/c/openstack/cinder-tempest-plugin/+/843319/1/.zuul.yaml#119

Change-Id: I721a494aa52129c58683f36853bc2fd064df48eb

.zuul.yaml

@@ -12,10 +12,14 @@
             voting: false
         - cinder-tempest-plugin-cbak-ceph
         - cinder-tempest-plugin-cbak-s3
+        # As per the Tempest "Stable Branch Support Policy", Tempest will only
+        # support the "Maintained" stable branches and not the "Extended Maintained"
+        # branches. That is what we need to do for all tempest plugins. Only jobs
+        # for the current releasable ("Maintained") stable branches should be listed
+        # here.
         - cinder-tempest-plugin-basic-yoga
         - cinder-tempest-plugin-basic-xena
         - cinder-tempest-plugin-basic-wallaby
-        - cinder-tempest-plugin-basic-victoria
         # Set this job to voting once we have some actual tests to run
         - cinder-tempest-plugin-protection-functional:
             voting: false
@@ -29,7 +33,6 @@
         - cinder-tempest-plugin-cbak-ceph-yoga
         - cinder-tempest-plugin-cbak-ceph-xena
         - cinder-tempest-plugin-cbak-ceph-wallaby
-        - cinder-tempest-plugin-cbak-ceph-victoria
 
 - job:
     name: cinder-tempest-plugin-protection-functional
@@ -116,7 +119,10 @@
     name: cinder-tempest-plugin-lvm-barbican-base
     description: |
       This is a base job for lvm with lio & tgt targets
-      with cinderlib tests to run on stable/train testing.
+      with cinderlib tests to run on stable/train to stable/victoria
+      testing. To run on those stable branches that are using tempest
+      26.1.0 (which is set in the devstack stackrc file), we must
+      use cinder-tempest-plugin compatible version 1.3.0.
     branches:
       - stable/train
       - stable/ussuri
@@ -182,12 +188,6 @@
     nodeset: openstack-single-node-focal
     override-checkout: stable/wallaby
 
-- job:
-    name: cinder-tempest-plugin-cbak-ceph-victoria
-    parent: cinder-tempest-plugin-cbak-ceph
-    nodeset: openstack-single-node-focal
-    override-checkout: stable/victoria
-
 # variant for pre-Ussuri branches (no volume revert for Ceph),
 # should this job be used on those branches
 - job:
@@ -288,9 +288,3 @@
     parent: cinder-tempest-plugin-basic
     nodeset: openstack-single-node-focal
     override-checkout: stable/wallaby
-
-- job:
-    name: cinder-tempest-plugin-basic-victoria
-    parent: cinder-tempest-plugin-basic
-    nodeset: openstack-single-node-focal
-    override-checkout: stable/victoria