Add support for softmaxcrossentropy loss to MIGraphX EP (#64) #10768

Job	Run time
Onnxruntime-SCA-training-CUDA	1h 22m 41s
Onnxruntime-SCA-win32-WebGPU-x64	56m 46s
Onnxruntime-SCA-win32-WINML-x64	1h 2m 16s
Onnxruntime-SCA-win32-WINML-x86	1h 0m 53s
	4h 22m 36s

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