Update style requirements in preparation for Ruff linter

[kwryankrattiger]

Keep old requirements for black/isort/flake8/ for transition Adds Ruff

[adamjstewart]

I would suggest we instead add both black/isort/flake8 and ruff in spack/spack and/or spack/spack-packages so we ensure that spackbot stays up-to-date with spack. Dependabot will eventually start updating things out of order and break something.

[kwryankrattiger]

I would suggest we instead add both black/isort/flake8 and ruff in spack/spack and/or spack/spack-packages so we ensure that spackbot stays up-to-date with spack. Dependabot will eventually start updating things out of order and break something.

So I took another approach. I am disabling Style in core, leaving it untouched for packages. This adds the ruff to the image.

When things are merged for core, we just uncomment disabling style.

For packages, this is all handled by the .ci/style-check.sh script which we can update whenever we update package style.