Add retries when getting related images

I have seen it fail once on a system and it worked on the
second run, so let's try a couple of times at least before
giving up.

ansible/roles/iib_ci/tasks/fetch-operator-images.yml

@@ -20,6 +20,9 @@
     oc get packagemanifests -l "catalog=iib-{{ iib }}" --field-selector "metadata.name={{ item }}" \
       -o jsonpath="{.items[0].status.channels[?(@.name==\"{{ default_channel }}\")].currentCSVDesc.relatedImages}"
   register: related_images_raw
+  retries: 5
+  delay: 10
+  until: related_images_raw is not failed
 
 - name: Set related_images fact
   ansible.builtin.set_fact: