Change knowledge base to dataset (#11976)

### What problem does this PR solve?

As title

### Type of change

- [x] Refactoring

---------

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

rag/utils/infinity_conn.py

@@ -521,7 +521,7 @@ class InfinityConnection(DocStoreConnection):
             try:
                 table_instance = db_instance.get_table(table_name)
             except Exception:
-                logger.warning(f"Table not found: {table_name}, this knowledge base isn't created in Infinity. Maybe it is created in other document engine.")
+                logger.warning(f"Table not found: {table_name}, this dataset isn't created in Infinity. Maybe it is created in other document engine.")
                 continue
             kb_res, _ = table_instance.output(["*"]).filter(f"id = '{chunkId}'").to_df()
             logger.debug(f"INFINITY get table: {str(table_list)}, result: {str(kb_res)}")