So far, our ruff config was confined to the f2 package. This meant, that
when one added additional paths to the ruff formatter, those wouldn't
get the same rules applied as f2, resulting in inconsistent styling
thoughout the project.
Due to how configs are resolved, only the "closesed" pyproject toml is
considered. This means, we need to tell f2 to extend its configuration
with the base level one. Though no change is required for other parts of
the project, as long as they don't have their own pyproject.toml
Change-Id: I145c764e7b850194020b5560e1025f4aa80411ae