Add detailed logging to remote runtime resume process

[rbren]

• 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.

Improved logging for remote runtime resume operations to help diagnose issues when paused runtimes fail to resume properly.

---

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

This PR adds detailed logging to the remote runtime resume process to help diagnose issues when we fail to call /resume on a paused runtime. The changes include:

1. Added info logs to track the code path through _start_or_attach_to_runtime
2. Added detailed logging in _check_existing_runtime to track runtime status and resume attempts
3. Added comprehensive try/except blocks with logging in _resume_runtime to capture any failures during the resume process
4. Added detailed logging in the 503 response handler where we attempt to resume paused runtimes
5. Removed redundant prefix from log messages since this information is already included in the log extras

---

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:cff7207-nikolaik   --name openhands-app-cff7207   docker.all-hands.dev/all-hands-ai/openhands:cff7207