fix(http): fail fast on GitHub API rate limit instead of hanging

[LalatenduMohanty]

Summary

• Add GitHubRateLimitError exception that raises immediately when the GitHub API rate limit reset is more than 120 seconds away, instead of sleeping 300s per retry for up to ~40 minutes
• The error message suggests setting GITHUB_TOKEN to increase the limit from 60 to 5000 requests/hour
• Short waits (under 120s) still sleep and retry as before

Closes: #1118

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📥 Commits

Reviewing files that changed from the base of the PR and between b5b31d9 and d9ad52b.

📒 Files selected for processing (2)

• src/fromager/http_retry.py
• tests/test_http_retry.py

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