🧪 Add tests for testUrls edge cases and fix fallback

[sunnylqm]

🎯 What: Handled promiseAny rejection to prevent unhandled promise rejections when all testUrls calls fail, safely falling back to urls[0].
📊 Coverage: Added tests to cover the happy path (200 OK), the fastest response test (using Promise.race logic with mock.module), and the fallback edge case when all URLs reject.
✨ Result: A more robust URL selection system with tests validating the exact behavior instead of relying on unpredictable environment configuration.

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PR created automatically by Jules for task 4000577860789812473 started by @sunnylqm

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 45e4562a-5a8f-48c7-aaa7-aec49aadaab7

📥 Commits

Reviewing files that changed from the base of the PR and between 2be3698 and 7ca43aa.

📒 Files selected for processing (2)

• src/utils/http-helper.ts
• tests/http-helper.test.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch jules-4000577860789812473-7f274752

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