Changed type of networkIdentifier from PublicIPAddress to SubResource (

#29469)

* added networkidentifier under vnet->subet->serviceendpoint

* added format :armid and updated description

* corrected the type

* fixed response

* response type fixed example

* Changed type of networkIdentifier from ./publicIpAddress.json#/definitions/PublicIPAddress to ./network.json#/definitions/SubResource

---------

Co-authored-by: Bhupesh Bhatt <bhupeshbhatt@microsoft.com>

specification/network/resource-manager/Microsoft.Network/stable/2024-01-01/virtualNetwork.json

@@ -1688,8 +1688,8 @@
           "description": "The type of the endpoint service."
         },
         "networkIdentifier": {
-          "$ref": "./publicIpAddress.json#/definitions/PublicIPAddress",
-          "description": "Public IP Address Resource as network identifier."
+          "$ref": "./network.json#/definitions/SubResource",
+          "description": "SubResource as network identifier."
         },
         "locations": {
           "type": "array",