DCD-803: Ignore COMMENT ON EXTENSION errors when restoring to RDS

roles/restore_backups/tasks/main.yml

@@ -97,6 +97,10 @@
         # Depends on fetch_backup roles
         state: restore
         target: "{{ atl_backup_db_dest }}"
+      register: result
+      failed_when:
+        - result.rc != 0
+        - "COMMENT ON EXTENSION" not in result.msg
       when: db_created.changed and atl_backup_db_dest is defined