Add health monitoring tests for draining writers

- Introduced adversarial tests to validate the behavior of the health monitoring system under various conditions, including the management of draining writers.
- Implemented integration tests to ensure the health monitor correctly handles expired and empty draining writers.
- Added regression tests to verify the functionality of the draining writers' cleanup process, ensuring it adheres to the defined thresholds and budgets.
- Updated the module structure to include the new test files for better organization and maintainability.

src/main.rs

@@ -6,6 +6,8 @@ mod config;
 mod crypto;
 mod error;
 mod ip_tracker;
+#[cfg(test)]
+mod ip_tracker_regression_tests;
 mod maestro;
 mod metrics;
 mod network;