test: add a test to verify withFileTypes case

add a test with withFileTypes true

Fixes: #60936

Author: y-okt

test/parallel/test-fs-readdir-promise-recursive-with-buffer.js

@@ -10,3 +10,5 @@ const { join } = require('node:path');
 
 const testDirPath = join(__dirname, '..', '..');
 readdir(Buffer.from(testDirPath), { recursive: true }).then(common.mustCall());
+
+readdir(Buffer.from(testDirPath), { recursive: true, withFileTypes: true }).then(common.mustCall());