SIENTIAPDE-1182

Implement prediction store policy handling in Gates activity

- Added a new method `get_prediction_store_policy` to validate and parse the prediction store policy.
- Updated `format_prediction` method to utilize the new policy handling, allowing for sorting of predictions based on the specified policy.
- Enhanced test coverage for the new policy handling, including various scenarios for valid and invalid policies.
- Removed the obsolete `coverage.sh` script.

laborious/workflows/sub_workflows/format_and_export_prediction.py

@@ -52,6 +52,8 @@ class FormatAndExportPrediction():
                     'timestamp': input_data['timestamp'],
                     'model_id': input_data['model_id'],
                     'prediction_confidence': prediction_confidence,
+                    'prediction_store_policy': input_data.get(
+                        'prediction_store_policy', 'lts:1')
                 },
                 retry_policy=retry_policy,
                 start_to_close_timeout=timedelta(seconds=60)