[Relay][Frontend[Onnx] Add testing for output datatypes and fix related bugs. #7364
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@masahi encountered a bug due to our importer using int32 for topk rather than onnx's specified int64. To prevent similar errors, I've added an output datatype check to our onnx tests. This check uncovered a datatype mismatch in ArgMin and ArgMax that are also fixed in this PR.