[ONNX][RELAX] replace topi.split with relax.op.split in the onnx frontend #17642
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Replaces topi.split with relax.op.split in the ONNX frontend to align with the Relax operator API.
Fixes related ONNX frontend unit tests by:
Fixes split unit tests when only one tensor is returned by changing the expected struct info from a TupleStructInfo to a TensorStructInfo.
The reason why it is necessary to update InferStructInfoSplit to return a TensorStructInfo instead of a TupleStructInfo when the split operator only returns a single tensor is because the MakeCallTIR api will unpack any tuple of struct info containing only one element. See tvm/src/relax/op/op.cc line 577: