test(billing): use fake timers in checkout webhook fallback test

[PierreBrisorgueil]

Summary

• Convert the should not throw when paymentIntents.update fails (non-fatal fallback) test to jest.useFakeTimers() + jest.runAllTimersAsync(), eliminating ~600ms of real retryWithBackoff backoff delay per run (≈600ms → ~5ms).
• Restore real timers in afterEach so fake timers can't leak into sibling tests.
• Assertions unchanged (resolves undefined + creditPack still called with the right args).

Test plan

• npm run test:unit — checkout webhook suite green, target test now ~5ms
• lint clean
• no sibling-test regression

Closes #3689

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📥 Commits

Reviewing files that changed from the base of the PR and between 3df0034 and 586e078.

📒 Files selected for processing (1)

• modules/billing/tests/billing.webhook.checkout.unit.tests.js

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch test/billing-checkout-fake-timers

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[Copilot]

Pull request overview

Speeds up the billing checkout webhook unit test suite by eliminating real wall-clock backoff delays introduced by retryWithBackoff, while keeping existing assertions and behavior expectations intact.

Changes:

• Switch the “paymentIntents.update fails (non-fatal fallback)” unit test to jest.useFakeTimers() and jest.runAllTimersAsync() to advance retry backoff instantly.
• Add jest.useRealTimers() in afterEach to prevent fake-timer leakage into sibling tests.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.71%. Comparing base (3df0034) to head (586e078).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3698   +/-   ##
=======================================
  Coverage   89.71%   89.71%           
=======================================
  Files         142      142           
  Lines        4784     4784           
  Branches     1500     1500           
=======================================
  Hits         4292     4292           
  Misses        385      385           
  Partials      107      107           

Flag	Coverage Δ
integration	59.53% <ø> (ø)
unit	66.17% <ø> (ø)

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