[UT] Destroy process group after broadcast to resolve port occupation issues in multi-server tests#12379

Kangyan-Zhou merged 1 commit intosgl-project:mainsgl-project/sglang:mainfrom

galeselee:fix_ut_update_weight_from_distributedgaleselee/sglang:fix_ut_update_weight_from_distributedCopy head branch name to clipboard