Python files are missing Copyright headers

[darthtrevino]

If we enable header-checking in our Python files, we get a lot of linter errors. This should be fixed and part of our standard linting process.

Relevant Ruleset: https://docs.astral.sh/ruff/rules/#flake8-copyright-cpy

To enable this, we would add "CPY" to the selected ruleset in our ruff.toml file, and fix all issues that arise from this.

The following header text will resolve this:
# Copyright (c) 2024 Microsoft Corporation.

If we want to customize this header text, there is a setting for that here:
https://docs.astral.sh/ruff/settings/#lint_flake8-copyright_notice-rgx