ruff

a8a18e71 - red_knot_python_semantic: remove `WithDiagnostic` trait

red_knot_python_semantic: remove `WithDiagnostic` trait I did this mostly because it wasn't buying us much, and I'm trying to simplify the public API of the types I'd like to refactor in order to make the refactor simpler. If we really want something like this, we can re-add it later.