Add blocker for multi deployment (#1275)

Author: lu-ohai

ads/aqua/modeldeployment/deployment.py

@@ -1412,6 +1412,13 @@ def _update_model_group(
             The instance of DataScienceModelGroup.
         """
         model_group = DataScienceModelGroup.from_id(model_group_id)
+        if (
+            model_group.dsc_model_group.model_group_details.type
+            != DeploymentType.STACKED
+        ):
+            raise AquaValueError(
+                "Invalid 'model_deployment_id'. Only stacked deployment is supported to update."
+            )
         # create a new model group if fine tune weights changed as member models in ds model group is inmutable
         if update_model_deployment_details.models:
             if len(update_model_deployment_details.models) != 1:

tests/unitary/with_extras/aqua/test_deployment.py

@@ -2249,6 +2249,10 @@ def test_update_model_group_deployment(
         aqua_model_group = DataScienceModelGroup(
             spec=TestDataset.aqua_deployment_stack_model
         )
+        model_group_details = MagicMock(type="STACKED")
+        aqua_model_group.dsc_model_group = MagicMock(
+            model_group_details=model_group_details
+        )
         aqua_model_group.set_spec(
             aqua_model_group.CONST_BASE_MODEL_ID,
             "ocid1.datasciencemodel.oc1.iad.<OCID>",