chore: Update pre-commit checks

[raffaellasuardini]

• updated .pre-commit-config.yaml: inserted ruff and pre-commit hooks

• created Ruff configuratio in pyproject.toml

[marksweb]

The test failures might be a clue as to a change.

For the most part it's a case of this string\n in the test being asserted as this string so perhaps something in the test setup that's causing a newline character.

[marksweb]

@fsbraun If you've got some time, could you take a look and see if I'm missing something with the tests?