Index partial parquet
It was failing to get the parquet files because it was not using the "partial-" split directory prefix for partially exported data

Fix https://github.com/huggingface/datasets-server/issues/1749
Index partial parquet: It was failing to get the parquet files because it was not using the "partial-" split directory prefix for partially exported data

Fix https://github.com/huggingface/datasets-server/issues/1749