[CLEAN] Synthetic Benchmark PR #31033 - Refactor FXIOS-13481 [Swift 6 Migration] Turn on Concurrency for SummarizerKit Tests in BrowserKit

[tomerqodo]

Benchmark PR mozilla-mobile#31033

Type: Clean (correct implementation)

Original PR Title: Refactor FXIOS-13481 [Swift 6 Migration] Turn on Concurrency for SummarizerKit Tests in BrowserKit
Original PR Description: ## 📜 Tickets
Jira ticket
Github issue

💡 Description

Fixed 33 Warnings in SummarizeKitTests including making trackMemoryLeaks MainActor.

cc: @cyndichin @lmarceau @Cramsden @issammani

📝 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

Original PR URL: mozilla-mobile#31033