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195e8f06 - [ty] Treat functions, methods, and dynamic types as function-like `Callable`s (#20842)

[ty] Treat functions, methods, and dynamic types as function-like `Callable`s (#20842) ## Summary Treat functions, methods, and dynamic types as function-like `Callable`s closes https://github.com/astral-sh/ty/issues/1342 closes https://github.com/astral-sh/ty/issues/1344 ## Ecosystem analysis All removed diagnostics look like cases of https://github.com/astral-sh/ty/issues/1344 ## Test Plan Added regression test