fix: add missing helm values for arc chart

Author: yoobinshin

charts/member-agent-arc/values.yaml

@@ -39,4 +39,8 @@ Azure:
     httpProxy: ""
     httpsProxy: ""
     noProxy: ""
-    proxyCert: ""
+    proxyCert: ""
+  Extension:
+    name: ""
+  Identity:
+    MSIAdapterYaml: ""