Change default value for privateendpointnetworkpolicy to disabled (#19577)

Author: Syair

specification/network/resource-manager/Microsoft.Network/stable/2022-01-01/virtualNetwork.json

@@ -1529,7 +1529,7 @@
         },
         "privateEndpointNetworkPolicies": {
           "type": "string",
-          "default": "Enabled",
+          "default": "Disabled",
           "description": "Enable or Disable apply network policies on private end point in the subnet.",
           "enum": [
             "Enabled",