test metadata

Author: AllyW

src/monitor-control-service/azext_amcs/azext_metadata.json

@@ -1,3 +1,4 @@
 {
-    "azext.minCliCoreVersion": "2.61.0"
+    "azext.minCliCoreVersion": "2.61.0",
+    "azext.isPreview": true
 }