Remove stable/wallaby job from master gate

stable/wallaby is in EM state. As Tempest and
plugins masters does not support Em stable branches
qa team is pinning tempest in devstack stable/wallaby
tesitng[1]. With that we do not need to test the
stable/wallaby jobs on master gate

[1] https://review.opendev.org/c/openstack/devstack/+/871782

Change-Id: If5db25580fc979f9b4184e3556d2e1f1ed227c6f
diff --git a/.zuul.yaml b/.zuul.yaml
index b3c1bbf..7bdfc0e 100644
--- a/.zuul.yaml
+++ b/.zuul.yaml
@@ -22,12 +22,6 @@
     nodeset: openstack-single-node-focal
     override-checkout: stable/xena
 
-- job:
-    name: designate-bind9-stable-wallaby
-    parent: designate-bind9
-    nodeset: openstack-single-node-focal
-    override-checkout: stable/wallaby
-
 - project:
     templates:
       - designate-devstack-jobs
@@ -41,5 +35,4 @@
         - designate-bind9-stable-zed
         - designate-bind9-stable-yoga
         - designate-bind9-stable-xena
-        - designate-bind9-stable-wallaby
         - neutron-tempest-plugin-designate-scenario