Refactor: enhance graphrag - part 2 (#14972)

### What problem does this PR solve?
1. expose batch_chunk_token_size for configuration
2. retrieve chunks when build subgraph for the doc, not retreive all
docs chunks at the begining
3. get all chunks for a document, used to be hard coded 10000
4. delete not used method run_graphrag

### Type of change

- [x] New Feature (non-breaking change which adds functionality)
- [x] Refactoring

Follow on: #14617

web/src/components/parse-configuration/graph-rag-form-fields.tsx

@@ -1,3 +1,4 @@
+import { FormLayout } from '@/constants/form';
 import { DocumentParserType } from '@/constants/knowledge';
 import { useTranslate } from '@/hooks/common-hooks';
 import { cn } from '@/lib/utils';
@@ -12,6 +13,7 @@ import { useCallback, useMemo } from 'react';
 import { useFormContext, useWatch } from 'react-hook-form';
 import { EntityTypesFormField } from '../entity-types-form-field';
 import { FormContainer } from '../form-container';
+import { SliderInputFormField } from '../slider-input-form-field';
 import {
   FormControl,
   FormField,
@@ -191,6 +193,19 @@ const GraphRagItems = ({
             )}
           />
 
+          <SliderInputFormField
+            name="parser_config.graphrag.batch_chunk_token_size"
+            label={t('graphRagBatchChunkTokenSize')}
+            tooltip={t('graphRagBatchChunkTokenSizeTip')}
+            max={8196}
+            min={512}
+            step={1}
+            defaultValue={4096}
+            layout={FormLayout.Horizontal}
+            sliderTestId="ds-settings-graph-batch-chunk-token-size-slider"
+            numberInputTestId="ds-settings-graph-batch-chunk-token-size-input"
+          ></SliderInputFormField>
+
           <FormField
             control={form.control}
             name="parser_config.graphrag.resolution"