Update prediction_store_policy handling in workflows
- Added 'prediction_store_policy' to the input data handling in PredictionsBatch, ensuring a default value of 'lts:1' is used when not provided.
- Modified FormatAndExportPrediction to directly use 'prediction_store_policy' from input_data, removing the default fallback.
- Updated PredictionProcess to include 'prediction_store_policy' in the output data structure, ensuring consistency across workflows.
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