test: Mark test_fp8_prefill.py as xfail on SM90#2038

yzh119 merged 2 commits intoflashinfer-ai:mainflashinfer-ai/flashinfer:mainfrom

bkryu:sm90_fp8_prefill_test_disablebkryu/flashinfer:sm90_fp8_prefill_test_disableCopy head branch name to clipboard