Add CUDA Attention spec-coverage tests (GQA asymmetric head-size, output_qk, fp32 softcap+mask ordering)#28371

titaiwangms wants to merge 5 commits into

microsoft:mainmicrosoft/onnxruntime:mainfrom

titaiwangms:fix-attention-spec-gaps-and-gqa-teststitaiwangms/onnxruntime:fix-attention-spec-gaps-and-gqa-testsCopy head branch name to clipboard