add the 'I' selector to ruff config to sort imports

[harrisonpim]

Ruff can sort imports by itself!

I've also trimmed the outer pyproject.toml and .pre-commit-config.yaml stuff as much as possible (I don't think we need to format any python within the template itself), while adding what we want to the corresponding files in {{ cookiecutter.repo_name }}.

[linear]

RND-687 Add isort to the list of pre-commit hooks across data science repos

[kdutia]

I actually think we do want to keep formatting in the repo root, as we can make sure any boilerplate code we add to this is of good quality. Unless you're saying we can use the version in the template?

[kdutia]

also, feel free to remove import sorting as i've had issues with it failing in CI despite passing locally too. i'm disabling it on other repos you've PRed and keeping the ruff-as-black-replacement stuff