Zed-only: Remove TripleO job

... because the stable/zed branch of TripleO repos is no longer
maintained.

Change-Id: Ic0b3fe82497defb74b3c2918c45ffeac693edad2

.zuul.yaml

@@ -4,29 +4,4 @@
       - puppet-openstack-module-unit-jobs
       - puppet-openstack-integration-jobs-all
       - puppet-openstack-litmus-jobs
-      - tripleo-puppet-undercloud
       - release-notes-jobs-python3
-    check:
-      jobs:
-        - puppet-neutron-tripleo-standalone
-    gate:
-      jobs:
-        - puppet-neutron-tripleo-standalone
-
-- job:
-    name: puppet-neutron-tripleo-standalone
-    parent: tripleo-puppet-ci-centos-9-standalone
-    description: |
-      TripleO standalone Job running Neutron specific Tempest tests.
-    vars:
-      consumer_job: true
-      build_container_images: false
-      remove_tags:
-        - build
-      featureset_override:
-        run_tempest: false
-        tempest_test_whitelist:
-          - 'tempest.scenario.test_network_basic_ops.TestNetworkBasicOps.test_network_basic_ops'
-        use_os_tempest: true
-    dependencies:
-      - tripleo-puppet-ci-centos-9-content-provider