Recover gracefully from git 429 rate-limits on overleaf

[j6k4m8]

Right now it crashes the server, which is probably not the ideal user experience.

This line in the refresh (called from the constructor) is the offender:

https://github.com/KordingLab/llm4papers/blob/af7a1088604083a9f215a1e8abeadd7fca3395cd/llm4papers/paper_remote/OverleafGitPaperRemote.py#L92