onnxruntime

Enable cpp20 builds for DML EP and WinML API (#17800)

Enable cpp20 builds for DML EP and WinML API

1) Missing typename for templated types
2) unmove helper for inline references to rvalue temporaries
This is okay since per the standard a temporary bound to a reference
parameter in a function call exists until the end of the full expression
containing that function call: if the function returns a reference,
which outlives the full expression, it becomes a dangling reference.

3) static now not needed for template specializations

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Co-authored-by: Sheil Kumar <sheilk@microsoft.com>