Add centos-9 jobs for wallaby zuul layout

Adds puppet-oslo-tripleo-centos-9-standalone definition to the
zuul layout. This is added as non voting as puppet openstack
will not support c9 on wallaby.

See the topic branch [1] for related reviews and [2] for context.

[1] https://review.opendev.org/q/topic:c9_wallaby_gates
[2] http://lists.openstack.org/pipermail/openstack-discuss/2022-February/027403.html

Depends-On: https://review.opendev.org/c/openstack/puppet-openstack-integration/+/831206
Change-Id: Ifdf513a8202ba81938b1e9224c430d9a15192556

.zuul.yaml

@@ -7,6 +7,7 @@
     check:
       jobs:
         - puppet-oslo-tripleo-standalone
+        - puppet-oslo-tripleo-centos-9-standalone
     gate:
       jobs:
         - puppet-oslo-tripleo-standalone
@@ -16,10 +17,18 @@
     parent: tripleo-puppet-ci-centos-8-standalone
     description: |
       TripleO standalone Job running basic tests
-    vars:
+    vars: &standalone_vars
       build_container_images: true
       featureset_override:
         run_tempest: false
         tempest_test_whitelist:
           - 'tempest.scenario.test_server_basic_ops'
         use_os_tempest: true
+
+- job:
+    name: puppet-oslo-tripleo-centos-9-standalone
+    parent: tripleo-puppet-ci-centos-9-standalone
+    voting: false
+    description: |
+      TripleO standalone Job running basic tests centos 9
+    vars: *standalone_vars