[azure-mgmt-monitor] skip test to unblock ci (Azure#19390)

* skip test

* Update test_cli_mgmt_monitor_async.py

Author: Rakshith Bhyravabhotla

sdk/monitor/azure-mgmt-monitor/tests/test_cli_mgmt_monitor_async.py

@@ -6,6 +6,7 @@
 # license information.
 #--------------------------------------------------------------------------
 import time
+import pytest
 import unittest
 
 import azure.mgmt.monitor.aio
@@ -281,6 +282,7 @@ def create_network_interface(self, group_name, location, nic_name, subnet):
         result = self.vm_client.virtual_machines.create_or_update(group_name, vm_name, BODY)
         return result.result()
 
+    @pytest.mark.skip("https://github.com/Azure/azure-sdk-for-python/issues/19389")
     @RandomNameResourceGroupPreparer(location=AZURE_LOCATION)
     def test_monitor_diagnostic_settings(self, resource_group):
         SUBSCRIPTION_ID = self.settings.SUBSCRIPTION_ID