SIENTIAPDE-1312

Refactor OpcManager connection error handling and enhance unit tests

- Simplified error handling during connection attempts in OpcManager by removing redundant disconnection logic.
- Updated unit tests to include subscription_period_ms in server configuration and adjusted connection assertions to include a timeout parameter.
- Added new tests for disconnection fallback functionality to ensure robust error handling during disconnect attempts.

tests/unit/managers/test_ingestor_manager.py

@@ -94,6 +94,7 @@ async def test_initialize_opc_from_config(opc_manager, ingestor_manager):
     server_config = {
         'name': 'server1',
         'url': 'opc.tcp://localhost:4840',
+        'subscription_period_ms': 1000,
         'server_uri': 'http://opcua-server.simulator',
         'cert_path': '/path/to/cert',
         'private_key_path': '/path/to/private_key',
@@ -109,6 +110,7 @@ async def test_initialize_opc_from_config(opc_manager, ingestor_manager):
         url=server_config['url'],
         data_manager=ingestor_manager.data_manager,
         logger=ingestor_manager.logger,
+        subscription_period_ms=server_config['subscription_period_ms'],
         server_uri=server_config['server_uri'],
         notification_handler=ingestor_manager.notification_handler,
         cert_path=server_config['cert_path'],
@@ -128,6 +130,7 @@ async def test_initialize_opc_from_config_exception(traceback_mock, opc_manager,
     server_config = {
         'name': 'server1',
         'url': 'opc.tcp://localhost:4840',
+        'subscription_period_ms': 1000,
         'server_uri': 'http://opcua-server.simulator',
         'cert_path': '/path/to/cert',
         'private_key_path': '/path/to/private_key',