Update metricStorage NAD kuttl tests

Drop NAD config from deploy-edpm-resources
Add configure-nad-metricstorage test which covers
the scenario in which TLS is enabled and a NAD is set
for a metricStorage.

Related Bug: https://issues.redhat.com/browse/OSPRH-14663

Author: vkmc

tests/kuttl/suites/metricstorage/tests/06-deploy-edpm-resources.yaml

@@ -14,5 +14,3 @@ spec:
       retention: 24h
       persistent:
         pvcStorageRequest: 20G
-  networkAttachments:
-  - ctlplane

tests/kuttl/suites/tls/tests/03-configure-nad-metricstorage.yaml

@@ -0,0 +1,20 @@
+---
+apiVersion: telemetry.openstack.org/v1beta1
+kind: MetricStorage
+metadata:
+  name: telemetry-kuttl-metricstorage
+spec:
+  monitoringStack:
+    alertingEnabled: true
+    scrapeInterval: 30s
+    storage:
+      strategy: persistent
+      retention: 24h
+      persistent:
+        pvcStorageRequest: 20G
+  prometheusTls:
+    caBundleSecretName: combined-ca-bundle
+    secretName: cert-metric-storage-prometheus-svc
+  dataplaneNetwork: ctlplane
+  networkAttachments:
+  - ctlplane