feat: Improve flaky tests and add error messages

[chrfwow]

Makes some tests more robust

[gemini-code-assist[bot]]

Summary of Changes

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This pull request focuses on improving the stability and diagnostic capabilities of existing tests. It addresses flakiness in a specific test by introducing more precise timing measurements and detailed error reporting. Additionally, it enhances the robustness of end-to-end tests by adopting a thread-safe data structure for event collection, ensuring reliable behavior in concurrent environments.

Highlights

• Improved Test Robustness: Enhanced the callingInitialize_wakesUpWaitingThread test in FlagdProviderSyncResourcesTest.java by replacing a simple boolean flag with a precise time measurement (AtomicLong waitTime). This change allows for more accurate assessment of the waiting duration and provides a detailed error message upon failure, making the test less flaky and easier to debug.
• Enhanced Concurrency for E2E Events: Switched the event collection mechanism in end-to-end tests from LinkedList to ConcurrentLinkedQueue in State.java and EventSteps.java. This change improves thread safety and performance for concurrent event handling, making the e2e tests more reliable in multi-threaded scenarios.

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