fix: remove Top K in retrieval testing #770 and if the document parsing fails, the error message returned by the backend is displayed (#782)

### What problem does this PR solve?

fix: remove Top K in retrieval testing  #770
fix: if the document parsing fails, the error message returned by the
backend is displayed.

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

web/src/pages/add-knowledge/components/knowledge-chunk/components/document-preview/preview.tsx

@@ -11,6 +11,8 @@ import {
 import { useGetChunkHighlights } from '../../hooks';
 import { useGetDocumentUrl } from './hooks';
 
+import { useCatchDocumentError } from '@/components/pdf-previewer/hooks';
+import FileError from '@/pages/document-viewer/file-error';
 import styles from './index.less';
 
 interface IProps {
@@ -30,9 +32,11 @@ const HighlightPopup = ({
 // TODO: merge with DocumentPreviewer
 const Preview = ({ selectedChunkId }: IProps) => {
   const url = useGetDocumentUrl();
+  useCatchDocumentError(url);
   const { highlights: state, setWidthAndHeight } =
     useGetChunkHighlights(selectedChunkId);
   const ref = useRef<(highlight: IHighlight) => void>(() => {});
+  const error = useCatchDocumentError(url);
 
   const resetHash = () => {};
 
@@ -48,6 +52,7 @@ const Preview = ({ selectedChunkId }: IProps) => {
         url={url}
         beforeLoad={<Skeleton active />}
         workerSrc="/pdfjs-dist/pdf.worker.min.js"
+        errorMessage={<FileError>{error}</FileError>}
       >
         {(pdfDocument) => {
           pdfDocument.getPage(1).then((page) => {

web/src/pages/add-knowledge/components/knowledge-testing/testing-control/index.tsx

@@ -1,5 +1,5 @@
 import SimilaritySlider from '@/components/similarity-slider';
-import { Button, Card, Divider, Flex, Form, Input, Slider } from 'antd';
+import { Button, Card, Divider, Flex, Form, Input } from 'antd';
 import { FormInstance } from 'antd/lib';
 
 import { useTranslate } from '@/hooks/commonHooks';
@@ -9,7 +9,6 @@ import styles from './index.less';
 type FieldType = {
   similarity_threshold?: number;
   vector_similarity_weight?: number;
-  top_k?: number;
   question: string;
 };
 
@@ -36,22 +35,8 @@ const TestingControl = ({ form, handleTesting }: IProps) => {
       <p>{t('testingDescription')}</p>
       <Divider></Divider>
       <section>
-        <Form
-          name="testing"
-          layout="vertical"
-          form={form}
-          initialValues={{
-            top_k: 1024,
-          }}
-        >
+        <Form name="testing" layout="vertical" form={form}>
           <SimilaritySlider isTooltipShown></SimilaritySlider>
-          <Form.Item<FieldType>
-            label="Top K"
-            name={'top_k'}
-            tooltip={t('topKTip')}
-          >
-            <Slider marks={{ 0: 0, 2048: 2048 }} max={2048} />
-          </Form.Item>
           <Card size="small" title={t('testText')}>
             <Form.Item<FieldType>
               name={'question'}