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fb66f715 - [red-knot] Enhancing Diagnostics for Compare Expression Inference (#13819)

[red-knot] Enhancing Diagnostics for Compare Expression Inference (#13819) ## Summary - Refactored comparison type inference functions in `infer.rs`: Changed the return type from `Option` to `Result` to lay the groundwork for providing more detailed diagnostics. - Updated diagnostic messages. This is a small step toward improving diagnostics in the future. Please refer to #13787 ## Test Plan mdtest included! --------- Co-authored-by: Carl Meyer <carl@astral.sh>