refactor(notion-page-preview): update fetchNotionPagePreview to include pageType parameter for improved API request

web/app/components/datasets/create/notion-page-preview/index.tsx

       const res = await fetchNotionPagePreview({
         workspaceID: currentPage.workspace_id,
         pageID: currentPage.page_id,
+        pageType: currentPage.type,
         credentialID: notionCredentialId,
       })
       setPreviewContent(res.content)

web/service/datasets.ts

   return post<FileIndexingEstimateResponse>('/datasets/indexing-estimate', { body })
 }
 
-export const fetchNotionPagePreview: Fetcher<{ content: string }, { workspaceID: string; pageID: string; credentialID: string; }> = ({ workspaceID, pageID, credentialID }) => {
-  return get<{ content: string }>(`notion/workspaces/${workspaceID}/pages/${pageID}/preview`, {
+export const fetchNotionPagePreview: Fetcher<{ content: string }, { workspaceID: string; pageID: string; pageType: string; credentialID: string; }> = ({ workspaceID, pageID, pageType, credentialID }) => {
+  return get<{ content: string }>(`notion/workspaces/${workspaceID}/pages/${pageID}/${pageType}/preview`, {
     params: {
       credential_id: credentialID,
     },