workbench: Make report-notebook-metrics but unmodifiable (#15080)

Author: bcreddy-gcp

mmv1/templates/terraform/constants/workbench_instance.go.tmpl

@@ -26,6 +26,7 @@ func WorkbenchInstanceLabelsDiffSuppress(k, old, new string, d *schema.ResourceD
 var WorkbenchInstanceSettableUnmodifiableDefaultMetadata = []string{
 	"install-monitoring-agent",
 	"serial-port-logging-enable",
+	"report-notebook-metrics",
 }
 
 var WorkbenchInstanceEUCProvidedAdditionalMetadata = []string{
@@ -84,7 +85,6 @@ var WorkbenchInstanceProvidedMetadata = []string{
     "proxy-user-mail",
     "report-container-health",
     "report-event-url",
-    "report-notebook-metrics",
     "report-system-health",
     "report-system-status",
     "resource-url",