[nonprod] Introduce bad configuration to test GCP retry queue and alerting (#1086)

Author: leplatrem

config/config.nonprod.yaml

@@ -15,12 +15,14 @@
         - add_link_to_jira
         - maybe_assign_jira_user
         - maybe_update_issue_status
+        - maybe_update_issue_severity
         - sync_whiteboard_labels
         - sync_keywords_labels
       existing:
         - update_issue_summary
         - maybe_assign_jira_user
         - maybe_update_issue_status
+        - maybe_update_issue_severity
         - sync_whiteboard_labels
         - sync_keywords_labels
       comment: