Zed-only: Remove TripleO job

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 because the stable/zed branch of TripleO repos is no longer
maintained.

Change-Id: I52be03042422e0e9f87ac01e6ac0f493140f970b

.zuul.yaml

@@ -5,24 +5,3 @@
       - puppet-openstack-integration-jobs-scenario003
       - puppet-openstack-litmus-jobs
       - release-notes-jobs-python3
-    check:
-      jobs:
-        - puppet-heat-tripleo-standalone
-    gate:
-      jobs:
-        - puppet-heat-tripleo-standalone
-
-- job:
-    name: puppet-heat-tripleo-standalone
-    parent: tripleo-puppet-ci-centos-9-standalone
-    description: |
-      TripleO standalone Job running Heat specific Tempest tests.
-    vars:
-      build_container_images: true
-      featureset_override:
-        run_tempest: false
-        # NOTE(tkajinam): This should be fixed once any heat tempest test is
-        #                 enabled in TripleO repo.
-        tempest_test_whitelist:
-          - 'tempest.scenario.test_server_basic_ops'
-        use_os_tempest: true