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5853eb28 - [red-knot] allow assignment expression in call compare narrowing (#17461)

[red-knot] allow assignment expression in call compare narrowing (#17461) ## Summary There was some narrowing constraints not covered from the previous PR ```py def _(x: object): if (type(y := x)) is bool: reveal_type(y) # revealed: bool ``` Also, refactored a bit ## Test Plan Update type_api.md