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096264dd - [ty] Detect overrides of `Final` class variables in subclasses (#23180)

[ty] Detect overrides of `Final` class variables in subclasses (#23180) ## Summary Adds a new `override-of-final-variable` diagnostic that flags subclass attributes that override a superclass attribute declared as `Final`. Closes https://github.com/astral-sh/ty/issues/871.