SIENTIAPDE-1646

Update README, requirements, and E2E tests for improved configuration and functionality

- Enhanced the README with updated model configuration examples, including the addition of an alias for production.
- Removed the `requirements-light.txt` file and updated `requirements-local.txt` and `requirements.txt` to replace `asyncua` with `opcua`.
- Refactored E2E test scenarios to utilize scenario input files for better maintainability and clarity.
- Improved test coverage for MinIO offload functionality and added new helper functions for loading scenario inputs.
- Updated `values.yaml` to reflect new global configurations and environment variables for the laborious worker.

tests/conftest.py

@@ -3,6 +3,19 @@ import os
 from sientia_do.temporal.activities.postgres_sync import Postgres
 
 
+def _noop_postgres_del(_self):
+    """
+    Unit tests use MagicMock metrics controllers; postgres_sync.Postgres.__del__ calls
+    close() during GC and triggers async shutdown. Explicit ``close()`` is covered in tests.
+    """
+    return None
+
+
+Postgres.__del__ = _noop_postgres_del  # type: ignore[method-assign]
+
+from sientia_do.temporal.activities.postgres_sync import Postgres
+
+
 def _noop_postgres_del(_self):
     """
     Unit tests use MagicMock metrics controllers; postgres_sync.Postgres.__del__ calls