[KM-556] flatten document_pipeline folder into single module

src/pipeline/{document_pipeline/document_pipeline.py → document_pipeline.py}

@@ -5,7 +5,7 @@ from sqlalchemy.ext.asyncio import AsyncSession
 
 from src.document.document_service import document_service
 from src.knowledge.processing_service import knowledge_processor
-from src.knowledge.parquet_service import delete_document_parquets
+from src.storage.parquet import delete_document_parquets
 from src.middlewares.logging import get_logger
 from src.storage.az_blob.az_blob import blob_storage