prenounce cmd deprecate

Author: AllyW

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

@@ -0,0 +1,11 @@
+# --------------------------------------------------------------------------------------------
+# 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_command_deprecate
+
+register_command_deprecate('security automation create_or_update')
+register_command_deprecate('security automation validate')
+
+# This command has been deprecated and will be removed in next breaking change release(2.73.0).