[ARM] az policy: Add deprecation message for breaking change pre-announcement (#31458)

Author: mentat9

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

@@ -0,0 +1,45 @@
+# --------------------------------------------------------------------------------------------
+# 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_other_breaking_change
+
+register_other_breaking_change(
+    'policy assignment identity remove',
+    'Removing a user assigned identity will change in a future release of the resource commands. '
+    'It will require providing the --mi-user-assigned switch.')
+register_other_breaking_change(
+    'policy assignment identity assign',
+    'Replacing an existing identity will change in a future release of the resource commands. '
+    'It will require first removing the existing identity.')
+register_other_breaking_change(
+    'policy assignment non-compliance-message create',
+    'The return value will change in a future release of the resource commands. '
+    'It will be the single created message object rather than the full array of message objects.')
+register_other_breaking_change(
+    'policy assignment non-compliance-message delete',
+    'The return value will change in a future release of the resource commands. '
+    'It will be empty rather than the full array of remaining message objects.')
+register_other_breaking_change(
+    'policy assignment non-compliance-message create',
+    'The return value will change in a future release of the resource commands. '
+    'It will be the single created message object rather than the full array of message objects.')
+register_other_breaking_change(
+    'policy definition delete',
+    'Behavior will change in a future release of the resource commands. '
+    'Bypassing the confirmation prompt will require providing the -y switch.')
+register_other_breaking_change(
+    'policy set-definition delete',
+    'Behavior will change in a future release of the resource commands. '
+    'Bypassing the confirmation prompt will require providing the -y switch.')
+register_other_breaking_change(
+    'policy exemption create',
+    'Date format will change slightly in a future release of the resource commands. '
+    'New format is ISO-8601, e.g. 2025-08-05T00:45:13Z instead of 2025-08-05T00:45:13+00:00.',
+    '--expires-on')
+register_other_breaking_change(
+    'policy exemption update',
+    'Date format will change slightly in a future release of the resource commands. '
+    'New format is ISO-8601, e.g. 2025-08-05T00:45:13Z instead of 2025-08-05T00:45:13+00:00.',
+    '--expires-on')