Data race in OfflineStorageHandler::GetAndReserveRecords

[thomasameisel]

Describe your environment.

SDK version: 3.7.62.1
OS version: iOS 17.0
Xcode version: 15.0
clang version:
Apple clang version 15.0.0 (clang-1500.0.40.1)
Target: arm64-apple-darwin22.6.0
Thread model: posix

Steps to reproduce.

1. Enable Thread Sanitizer
2. Open Outlook iOS
3. Open a message (triggers sending a telemetry event)

What is the expected behavior?
No data race

What is the actual behavior?
Data race

Additional context.
Full tsan logs here - tsanlogs.txt