fix(vfs): make dup/dup2/dup3 share open file description and move close_on_exec to per-fd#1783

fslongjin merged 2 commits intoDragonOS-Community:masterDragonOS-Community/DragonOS:masterfrom

fslongjin:refactor-fd-close-on-exec-per-fdfslongjin/DragonOS-fork:refactor-fd-close-on-exec-per-fdCopy head branch name to clipboard