enhancement: introduce Ruff for Python linter for reordering and removing unused imports with automated pre-commit and sytle check (#2366)

api/tasks/document_indexing_task.py

@@ -4,10 +4,10 @@ import time
 
 import click
 from celery import shared_task
+
 from core.indexing_runner import DocumentIsPausedException, IndexingRunner
 from extensions.ext_database import db
 from models.dataset import Document
-from werkzeug.exceptions import NotFound
 
 
 @shared_task(queue='dataset')