ruff

9a4b85d8 - [ty] Add tests for dataclass fields annotated with `Final` (#19202)

[ty] Add tests for dataclass fields annotated with `Final` (#19202) ## Summary Adds some tests for dataclass fields that are annotated with `Final` (see comment [here](https://github.com/astral-sh/ruff/pull/15768#issuecomment-3044737645)). Turns out that nothing is needed here, everything already works as expected (apart from the fact that we can assign to `Final` fields, which is tracked in https://github.com/astral-sh/ty/issues/158 ## Test Plan New Markdown tests