Use ruff for linting and code formatting

[jkarasti]

Replace black and isort with ruff for linting and code formatting and fixes everything found by ruffs default configuration. Also add one fix to rule them all from freedomofpress/securedrop-tooling/issues/11 and a complementary check target that runs ruff check, ruff format and mypy useful for CI. Note that this "reverts" #904.

This is ready for merge as is but not complete as I'd I'd like to enable more lint rules.

Closes #254

[almet]

Thanks @jkarasti for the work on this :-)

Here is some feedback:

• To me, make check conveys less meaning than make lint, so we might maybe keep the last one.
• We are currently using isort in addition to ruff, but ruff can do this for us. I think we should do this before merging.

Thanks a lot 👍 let me know when you need another review :-)

[jkarasti]

Here is some feedback:

* To me, `make check` conveys less meaning than `make lint`, so we might maybe keep the last one.

My thinking was to have a complementary target for fix so that there would be one target used to check for linting, formatting and typing issues and one target used to fix linting and formatting issues (mypy doesen't have a way to automatically apply fixes it seems). I can switch it back if you would prefer lint instead. These could also be lint/lint-check and lint-fix depending on if we want to follow what Securedrop devs are doing or not.

* We are currently using `isort` in addition to ruff, but ruff can [do this for us](https://docs.astral.sh/ruff/rules/#output-format). I think we should do this before merging.

I've enabled the isort rules.

[almet]

Thanks for enabling the I rules for isort, and for explaining your thinking.

Rather than having detailed targets, regrouping them behind the fix and lint targets seems to cut it while being self-explanatory. What do you think?

It's what the securedrop folks are doing, and having the same naming seems the right thing to do. Here's what's inside their makefile:

.PHONY: lint
lint:
	@ruff check .
	@ruff format --check .

.PHONY: fix
fix:
	@ruff check . --fix
	@ruff format .

Also, thanks for enabling the isort rule. The linter is currently failing with:

dangerzone/args.py:109: error: Unused "type: ignore" comment  [unused-ignore]