Refactor FXIOS-14344 [Swift 6 migration] Fixing DependencyHelperMock unit tests warning

[lmarceau]

📜 Tickets

Jira ticket
Github issue

💡 Description

Fix warning as we discussed in DependencyHelperMock. I'll close this task when this is merged

📝 Checklist

• I filled in the ticket numbers and a description of my work
• I updated the PR name to follow our PR naming guidelines
• I ensured unit tests pass and wrote tests for new code
• If working on UI, I checked and implemented accessibility (Dynamic Text and VoiceOver)
• If adding telemetry, I read the data stewardship requirements and will request a data review
• If adding or modifying strings, I read the guidelines and will request a string review from l10n
• If needed, I updated documentation and added comments to complex code

[lmarceau]

Needs more changes before review

[mobiletest-ci-bot]

💪 Quality guardian

55 tests files modified. You're a champion of test coverage! 🚀

🧩 Neat Piece

This PR changes 567 lines. It's a substantial update,
but still review-friendly if there’s a clear description. Thanks for keeping things moving! 🚀

🙌 Friday high-five

Thanks for pushing us across the finish line this week! 🙌

✅ Per-file coverage

All changed files meet the threshold of 35.0%.

Generated by 🚫 Danger Swift against 1a84423

[ih-codes]

That was a lot of work huh 😆 But this seems right to me!!

[github-actions]

🚀 PR merged to main, targeting version: 147.0