benchmark: fix api restriction for the permission category

give appropriate permissions to the following scripts:

* permission-processhas-fs-read.js: 'ChildProcess' permission
* permission-startup.js: 'FileSystemRead' permission
  > Paths delimited by comma (,) are no longer allowed.

Refs: https://github.com/nodejs/node/blob/main/doc/api/cli.md#--allow-fs-read
Signed-off-by: Ryan Qian <i@bitbili.net>
PR-URL: #51528
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>

benchmark/permission/permission-processhas-fs-read.js

@@ -13,6 +13,7 @@ const options = {
   flags: [
     '--experimental-permission',
     `--allow-fs-read=${rootPath}`,
+    '--allow-child-process',
   ],
 };
 

benchmark/permission/permission-startup.js

@@ -47,10 +47,10 @@ function spawnProcess(script, bench, state) {
 
 function main({ count, script, nFiles, prefixPath }) {
   script = path.resolve(__dirname, '../../', `${script}.js`);
-  const files = mockFiles(nFiles, prefixPath).join(',');
   const optionsWithScript = [
     '--experimental-permission',
-    `--allow-fs-read=${files},${script}`,
+    `--allow-fs-read=${script}`,
+    ...mockFiles(nFiles, prefixPath).map((file) => '--allow-fs-read=' + file),
     script,
   ];
   const warmup = 3;