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929eb523 - [ty] Enforce Final attribute assignment rules for annotated and augmented writes (#23880)

[ty] Enforce Final attribute assignment rules for annotated and augmented writes (#23880) ## Summary Reject `Final` attribute writes that previously slipped through the `annotated-assignment` and `augmented-`assignment code paths, e.g.: ```python self.x: Final[int] = 1 ``` Closes https://github.com/astral-sh/ty/issues/1888.