[NFC] Add more information on testing MDVals insertion in EmitDxilFunctionProps #5335
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A recent change from a recent PR includes changes to how the MDVals data structure inside of EmitDxilFunctionProps gets elements (push_back instead of index assignment).
However, there was no accompanying test for these changes, because HLSLFileCheck\hlsl\workgraph\called_function_arg_nodeoutput.hlsl exercised this code path and failed without the MDVals changes.
This PR adds some extra context to the above test so that the extra purpose the above test serves isn't lost with time.
The test passes with the MDVals pushback changes, and fails with the original valIdx index assignments.