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
1 file changed