Fix verify metrics rabbitmq command (#269)

The command was missing the --disable-rbac option, which caused
the test to fail after update to python-observabilityclient 0.5.0.

Author: vyzigold

roles/telemetry_verify_metrics/tasks/verify_rabbitmq_metrics.yml

@@ -39,7 +39,7 @@
     TEST Use openstack observabilityclient to verify rabbitmq metrics are stored in prometheus
     RHOSO-1215
   ansible.builtin.shell: |
-    {{ openstack_cmd }} metric query rabbitmq_identity_info{instance=\'{{ item }}.openstack.svc:15691\'}
+    {{ openstack_cmd }} metric query rabbitmq_identity_info{instance=\'{{ item }}.openstack.svc:15691\'} --disable-rbac
   register: result
   delay: 30
   retries: 10