Make runtime logs optional

[enyst]

End-user friendly description of the problem this fixes or functionality that this introduces

• Include this change in the Release Notes. If checked, you must provide an end-user friendly description for your change below
  Make the logs inside the runtime container optional (DEBUG_RUNTIME env var to set)

---

Give a summary of what the PR does, explaining any non-trivial design decisions

Follow-up from #5408 : make logs from inside the container optional

---

Link of any specific issues this addresses

---

To run this PR locally, use the following command:

docker run -it --rm   -p 3000:3000   -v /var/run/docker.sock:/var/run/docker.sock   --add-host host.docker.internal:host-gateway   -e SANDBOX_RUNTIME_CONTAINER_IMAGE=docker.all-hands.dev/all-hands-ai/runtime:7cc7373-nikolaik   --name openhands-app-7cc7373   docker.all-hands.dev/all-hands-ai/openhands:7cc7373

[xingyaoww]

LGTM!