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/managers/opc_manager.py

@@ -31,21 +31,6 @@ class OpcManager():
         return f"OpcManager(name={self.name}, url={self.url}, server_uri={self.server_uri})\n" \
             f"nodes={self.nodes}, subscriptions={self.subscriptions}"
 
-    def initialize_from_config(self, server_config: dict, data_manager: DataManager, logger: Logger):
-        """
-        Initializes the OpcManager instance using a server configuration dictionary.
-        Args:
-            server_config (dict): A dictionary containing server configuration details.
-            data_manager (DataManager): An instance of DataManager for data handling.
-            logger (Logger): Logger instance for logging information.
-        """
-        self.__init__(
-            server_config['name'], server_config['url'], data_manager, logger, server_config['server_uri'],
-            server_config.get('cert_path'), server_config.get(
-                'private_key_path'), server_config.get('server_cert_path')
-        )
-        self.config = server_config
-
     def set_security(self):
         """
         Configures the security settings for the OPC UA client.
@@ -161,10 +146,22 @@ class OpcManager():
         self.subscriptions[subscription].subscribe_data_change(self.addr_nodes)
 
     def unsubscribe(self, subscription: str):
+        """
+        Unsubscribes from a given subscription.
+        Args:
+            subscription (str): The name of the subscription to unsubscribe from.
+        Logs:
+            - A warning if the specified subscription does not exist.
+            - An info message upon successful unsubscription.
+        Behavior:
+            - If the subscription exists, it is deleted and removed from the 
+              subscriptions dictionary.
+            - If the subscription does not exist, no action is taken.
+        """
 
         if not self.subscriptions.get(subscription):
             self.logger.warning(
-                f"Subscription {subscription} not found. Cannot unsubscribe.")
+                f"Subscription '{subscription}' not found. Cannot unsubscribe.")
             return
         self.subscriptions[subscription].delete()
         del self.subscriptions[subscription]