SIENTIAPDE-988

Refactor OpcManager initialization and unsubscribe method; enhance logging

- Removed the `initialize_from_config` method from `OpcManager` class and adjusted the constructor to handle configuration directly.
- Improved the `unsubscribe` method to include detailed logging for non-existent subscriptions.
- Updated tests in `test_opc_manager.py` to reflect changes in the `OpcManager` class.
- Commented out Docker-related fixtures in `conftest.py` for potential future use.
- Enhanced test coverage in `test_single_node.py` and `test_data_manager.py` with additional scenarios and assertions.
- Introduced new methods in `Ingestor` and `IngestorManager` classes to manage server subscriptions and leases more effectively.
- Added new tests for `Ingestor` class to validate initialization and slot management logic.
- Implemented logging improvements across various classes to ensure better traceability of actions and errors.

ingestor/app.py

@@ -0,0 +1,19 @@
+from time import sleep
+from ingestor.ingestor import Ingestor
+
+
+def main():
+    ingestor = Ingestor()
+
+    ingestor.prepare_ingestor()
+
+    while True:
+
+        ingestor.loop()
+
+        # Sleep for poll interval
+        sleep(ingestor.poll_interval)
+
+
+if __name__ == "__main__":
+    main()