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d9616e61 - [red-knot] Disallow `todo_type!` without custom message (#17083)

[red-knot] Disallow `todo_type!` without custom message (#17083) ## Summary Disallow empty `todo_type!()`s without a custom message. They can lead to spurious diffs in `mypy_primer` where the only thing that's changed is the file/line information.