Refactor FXIOS-13481 [Swift 6 Migration] Turn on Concurrency for ContentBlockingGeneratorTests Tests in BrowserKit

[dataports]

📜 Tickets

Jira ticket
Github issue

💡 Description

Turn on ContentBlockingGeneratorTests Tests in BrowserKit. No changes needed.

📝 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

[mobiletest-ci-bot]

🧹 Tidy commit

Just 1 file(s) touched. Thanks for keeping it clean and review-friendly!

🙌 Friday high-five

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