Add job for testing watcher in the master pipeline

Since watcher-operator uses master and not antelope container, create
a job to run in the master pipeline to ensure new content does not break
watcher.

Author: cescgina

zuul.d/edpm_periodic.yaml

@@ -43,6 +43,24 @@
       registry_login_enabled: true
       cifmw_dlrn_report_result: true
 
+- job:
+    name: periodic-watcher-operator-validation-master
+    parent: watcher-operator-base
+    required-projects:
+      - openstack-k8s-operators/watcher-operator
+    vars:
+      <<: *edpm_multinode_vars
+      fetch_dlrn_hash: true
+      watcher_dlrn_tag: "{{ cifmw_repo_setup_promotion }}"
+      watcher_registry_url: quay.rdoproject.org/podified-master-centos9
+      cifmw_update_containers_openstack: true
+      # ensure we override the hook to deploy watcher so we can set the right
+      # content for the master pipeline
+      post_deploy:
+        - name: Deploy watcher service
+          type: playbook
+          source: "{{ watcher_hook }}"
+
 # Antelope jobs
 - job:
     name: periodic-podified-edpm-deployment-antelope-ocp-crc-1cs9