{ACR} az acr login: Add Upcoming Breaking Change Announcement (#31121)

Author: ReaNAiveD

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

@@ -0,0 +1,9 @@
+# --------------------------------------------------------------------------------------------
+# 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_output_breaking_change
+
+register_output_breaking_change(command_name='acr login',
+                                description='Exit code will be 1 if command fails for docker login')