Add DefaultDeploymentTemplate to mfe.json (#43221)

Author: daniel-rodrigues809

sdk/ml/azure-ai-ml/swagger/machinelearningservices/resource-manager/Microsoft.MachineLearningServices/preview/2021-10-01-dataplanepreview/mfe.json

@@ -5733,6 +5733,15 @@
           "description": "AssetId of origin model.",
           "type": "string",
           "x-nullable": true
+        },
+        "DefaultDeploymentTemplate": {
+          "type": "object",
+          "properties": {
+            "assetId": {
+              "type": "string",
+              "x-nullable": true
+            }
+          }
         }
       },
       "x-ms-client-name": "ModelVersionDetails",