Enhance unit tests for async shutdown and improve assertions
- Updated `test_app.py` to verify multiple calls to `asyncio_sleep` and ensure proper handling of sleep intervals.
- Added new tests in `test_ingestor.py` and `test_opc_manager.py` to validate shutdown behavior and error handling for async operations.
- Improved assertions in existing tests to enhance reliability and clarity of test outcomes.
Refactor tests for async compatibility and enhance IngestorManager functionality
- Updated test cases in `test_app.py`, `test_ingestor.py`, and `test_ingestor_manager.py` to use async/await syntax for improved concurrency.
- Refactored methods in IngestorManager and related classes to support asynchronous operations, ensuring non-blocking behavior during execution.
- Enhanced mock setups in tests to accommodate async methods, improving test reliability and performance.
Refactor unit tests to improve readability and maintainability
- Updated test assertions and mock setups in test_app.py for clarity.
- Added 'pod_id' to the metadata in test_ingestor.py for consistency.
- Introduced a new test for TAG_WRITTEN_COUNT in test_metrics.py to verify its definition.
- Enhanced test data structure in test_data_manager.py to include additional fields.
