Respect `timeout` in docker sandbox

[rbren]

Describe the bug Sometimes the agent tries to run commands like npm run start in the foreground. This just stalls out and everything hangs.

Steps to Reproduce

1. python opendevin/sandbox/sandbox.py to start a sandbox
2. run while true; do echo "." && sleep 1; done in the prompt

Expected behavior It quits after 120s (should we pick a different timeout? npm install can take a while...)

Actual behavior It hangs