Add license header to build_binary_tar_gz.py

Author: naga-nandyala

scripts/release/macos/build_binary_tar_gz.py

@@ -1,4 +1,8 @@
 #!/usr/bin/env python3
+# --------------------------------------------------------------------------------------------
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License. See License.txt in the project root for license information.
+# --------------------------------------------------------------------------------------------
 """Build Azure CLI tar.gz using Homebrew Python (no bundled Python).
 
 This build produces a lightweight tar.gz with: