[Compute] az vm/vmss create: Add warning log for changing the default value of VM size (#31409)

Author: yanzhudd

src/azure-cli/azure/cli/command_modules/vm/_breaking_change.py

@@ -0,0 +1,17 @@
+# --------------------------------------------------------------------------------------------
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License. See License.txt in the project root for license information.
+# --------------------------------------------------------------------------------------------
+from azure.cli.core.breaking_change import register_default_value_breaking_change
+
+register_default_value_breaking_change(command_name='vm create',
+                                       arg='--size',
+                                       current_default='Standard_DS1_v2',
+                                       new_default='Standard_D2s_v5',
+                                       target_version=None)
+
+register_default_value_breaking_change(command_name='vmss create',
+                                       arg='--vm-sku',
+                                       current_default='Standard_DS1_v2',
+                                       new_default='Standard_D2s_v5',
+                                       target_version=None)