[ONNX] Fix an issue with #5755 and add Batch norm unit tests. #5845
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@masahi
@jwfromm discovered an issue with #5755 , infer_value chokes on ops with multiple outputs. I already knew this for Tuple, this adds a work around to infer batch_norm with the following TupleGetItem node instead of by itself.
In adding a regression test, I discovered that the Onnx importer for batch norm wasn't tested, so I added a unit test for it.
Are you guys aware of any other multi-output ops that might suffer the same problem?