chore: log stack trace when failed to connect in mcp

[xingyaoww]

• This change is worth documenting at https://docs.all-hands.dev/
• Include this change in the Release Notes. If checked, you must provide an end-user friendly description for your change below

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

---

Summarize what the PR does, explaining any non-trivial design decisions.

---

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:1f002ef-nikolaik   --name openhands-app-1f002ef   docker.all-hands.dev/all-hands-ai/openhands:1f002ef