Enable batch request with content collection

Author: shemogumbe

src/msgraph_core/requests/batch_request_builder.py

@@ -108,6 +108,11 @@ async def _post_batch_collection(
 
         for batch_request_content in batch_request_content_collection.batches:
             request_info = await self.to_post_request_information(batch_request_content)
+            bytes_content = request_info.content
+            json_content = bytes_content.decode("utf-8")
+            updated_str = '{"requests":' + json_content + '}'
+            updated_bytes = updated_str.encode("utf-8")
+            request_info.content = updated_bytes
             response = await self._request_adapter.send_async(
                 request_info, BatchResponseContent, error_map or self.error_map
             )