A little Ruff around the edges

[alex-rakowski]

This PR changes the linter for flake8 to Ruff. We should agree on how exactly we want the linter configured before squashing and merging

• adds ruff.toml to configure ruff
• adds ruff.yml to configure and run ruff on only changed files in Github Actions
• updates pre-commit.yml to run black and ruff and removes flake8
• removes various flake8 config and Github Action files.

[CSSFrancis]

Just a comment, The Pre-commit CI is often a little easier to use then creating a github workflow

https://pre-commit.ci

I like it as you can just format other peoples code by running "pre-commit.ci autofix" which is helpful if you are trying to enforce things like code quality checks etc.