Move some constants to common (#11004)

### What problem does this PR solve?

As title.

### Type of change

- [x] Refactoring

---------

Signed-off-by: Jin Hai <haijin.chn@gmail.com>

api/db/services/task_service.py

@@ -23,12 +23,13 @@ from api.db.db_utils import bulk_insert_into_db
 from deepdoc.parser import PdfParser
 from peewee import JOIN
 from api.db.db_models import DB, File2Document, File
-from api.db import StatusEnum, FileType, TaskStatus
+from api.db import FileType
 from api.db.db_models import Task, Document, Knowledgebase, Tenant
 from api.db.services.common_service import CommonService
 from api.db.services.document_service import DocumentService
 from common.misc_utils import get_uuid
 from common.time_utils import current_timestamp
+from common.constants import StatusEnum, TaskStatus
 from deepdoc.parser.excel_parser import RAGFlowExcelParser
 from rag.settings import get_svr_queue_name
 from rag.utils.storage_factory import STORAGE_IMPL