test(api): verify async service layer mocking for resume upload route

[ThePriyanuj]

Closes #6806

[github-actions]

🚨 Hey @ThePriyanuj, the CI Pipeline is failing on this PR and it has been marked as status:blocked.

Please fix the issues before this can be reviewed. Here's how:

1. Run checks locally before pushing:

npm run format:check   # Check Prettier formatting
npm run lint           # Run ESLint
npm run typecheck      # TypeScript type check
npm run test           # Run unit tests (Vitest)
npm run build          # Verify production build passes

2. Auto-fix common issues:

npm run format         # Auto-fix formatting with Prettier
npm run lint -- --fix  # Auto-fix lint errors where possible

3. Check the full failure log here:
👉 View CI Run

Once you push a fix and the CI passes, the status:blocked label will be removed automatically. 💪

[ThePriyanuj]

Hi @JhaSourav07, my 5 mock integration tests for the resume upload route are passing perfectly. However, the CI pipeline is failing due to two unrelated tests (proxy.accessibility.test.ts and HistoricalTrendView.empty-fallback.test.tsx) failing on the base branch. Could you take a look when you have a moment, or let me know if you'd like me to attempt a fix for those separate issues?