ruff

1a3b7372 - [red-knot] Silence errors in unreachable type annotations / class bases (#17342)

[red-knot] Silence errors in unreachable type annotations / class bases (#17342) ## Summary For silencing `invalid-type-form` diagnostics in unreachable code, we use the same approach that we use before and check the reachability that we already record. For silencing `invalid-bases`, we simply check if the type of the base is `Never`. If so, we silence the diagnostic with the argument that the class construction would never happen. ## Test Plan Updated Markdown tests.