Configure ruff formatting for Python projects

[jab]

Projects generated with support for Python and linting+formatting are now configured to format Python code out-of-the-box.

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Changes are visible to end-users: yes

• Searched for relevant documentation and updated as needed: yes
• Breaking change (forces users to change their own code or config): no
• Suggested release notes appear above: yes

Test plan

• Manual testing:

1. Generate a project opting into Python + formatting
2. echo "'foo'" > foo.py
3. git init && git add .
4. bazel run //tools/format:format
   • output should include Formatted Python in 0m0.XYZs
   • git diff should show that the single quotes in foo.py were changed to double quotes