fix: downgrade sientia_do version and update CSV saving logic

- Downgraded `sientia_do` version to 1.11.0 in `requirements.txt` to address compatibility issues.
- Updated `data_manager_repository.py` to save training and test data CSVs using float-cast versions of the data, ensuring consistency in the saved outputs.
- Enhanced test coverage in `test_data_manager_repository.py` to verify the presence of the target alias in the generated CSV files.

model_manager/utils/repository/data_manager_repository.py

@@ -597,13 +597,14 @@ class DataManagerRepository(SientiaMonitoring):
         data.report_path = path.join(data.run_dir, 'report.html')
         report.save_all_sections_html(data.report_path)
 
-        # Save training data CSV
+        # Save training / validation CSVs using the same frames as the report (includes
+        # literal `target` alias for Evidently, plus predictions and float-cast features).
         data.train_data_path = path.join(data.run_dir, 'train_data.csv')
-        reference_data.to_csv(data.train_data_path, index=False)
+        reference_data_float.to_csv(data.train_data_path, index=False)
 
         # Save test data CSV
         data.test_data_path = path.join(data.run_dir, 'test_data.csv')
-        current_data.to_csv(data.test_data_path, index=False)
+        current_data_float.to_csv(data.test_data_path, index=False)
 
         # Save equation as JSON
         if data.equation is not None and data.params.model_type == 'linear_regression':