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Prevent error reporting from outputting a recursion error if it finds an ambiguous trait impl during suggestions Closes #89275 This fixes the compiler reporting a recursion error during another already in progress error by trying to make a conversion method suggestion and encounters ambiguous trait implementations that can convert a the original type into a type that can then be recursively converted into itself via another method in the trait. Updated OverflowError struct to be an enum so I could differentiate between passes - it's no longer a ZST but I don't think that should be a problem as they only generate when there's an error in compiling code anyway
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.