feat(tbench2_env): orphan TTL + ownership labels for per-task sandboxes#991

nblintao wants to merge 4 commits into

huggingface:mainhuggingface/OpenEnv:mainfrom

nblintao:tb2-sandbox-ttl-ownershipnblintao/OpenEnv:tb2-sandbox-ttl-ownershipCopy head branch name to clipboard