Refactor FXIOS-12796 [Swift 6 Migration] Fix main actor isolation warnings that are Swift 6 errors in the XCUITests suite - Batch 2

[ih-codes]

📜 Tickets

Jira ticket
Github issue

💡 Description

• Fix setUp/tearDown warnings in the XCUITests suite by using the async throws version of the methods
• Fix main actor isolation warnings for some local state with @MainActor

See the Swift 6 Migration channel (#tmp-swift-6-migration) for details on how to migrate the setUp and tearDown methods.

Batch 1: #31025

cc @Cramsden @lmarceau @dataports

📝 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

[clarmso]

@mdotb-moz FYI: Some Swift 6 warnings have been on the POM. I will follow up with the developers.

[mobiletest-ci-bot]

💪 Quality guardian

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

🥇 Perfect PR size

Smaller PRs are easier to review. Thanks for making life easy for reviewers! ✨

💬 Description craftsman

Great PR description! Reviewers salute you 🫡

✅ Per-file coverage

All changed files meet the threshold of 35.0%.

Generated by 🚫 Danger Swift against 70a97c6

[github-actions]

🚀 PR merged to main, targeting version: 147.0