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>

test/testcases/test_web_api/test_document_app/test_create_document.py

@@ -60,7 +60,7 @@ class TestDocumentCreate:
     def test_invalid_kb_id(self, WebApiAuth):
         res = create_document(WebApiAuth, {"name": "ragflow_test.txt", "kb_id": "invalid_kb_id"})
         assert res["code"] == 102, res
-        assert res["message"] == "Can't find this knowledgebase!", res
+        assert res["message"] == "Can't find this dataset!", res
 
     @pytest.mark.p3
     def test_filename_special_characters(self, WebApiAuth, add_dataset_func):

test/testcases/test_web_api/test_document_app/test_list_documents.py

@@ -51,7 +51,7 @@ class TestDocumentsList:
         "kb_id, expected_code, expected_message",
         [
             ("", 101, 'Lack of "KB ID"'),
-            ("invalid_dataset_id", 103, "Only owner of knowledgebase authorized for this operation."),
+            ("invalid_dataset_id", 103, "Only owner of dataset authorized for this operation."),
         ],
     )
     def test_invalid_dataset_id(self, WebApiAuth, kb_id, expected_code, expected_message):

test/testcases/test_web_api/test_document_app/test_upload_documents.py

@@ -136,7 +136,7 @@ class TestDocumentsUpload:
         fp = create_txt_file(tmp_path / "ragflow_test.txt")
         res = upload_documents(WebApiAuth, {"kb_id": "invalid_kb_id"}, [fp])
         assert res["code"] == 100, res
-        assert res["message"] == """LookupError("Can't find this knowledgebase!")""", res
+        assert res["message"] == """LookupError("Can't find this dataset!")""", res
 
     @pytest.mark.p2
     def test_duplicate_files(self, WebApiAuth, add_dataset_func, tmp_path):