Add utils script to create folders to prebuild React Native core (#51194)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/51194

This change adds an utils script to set up folders when needed.

## Changelog:

[INTERNAL] - Add utils script

Test Plan: This is tested in the next diff of the stack.

Reviewed By: cortinico

Differential Revision: D74393298

Pulled By: cipolleschi

fbshipit-source-id: db3db61ec938d2ebe5c0bf5ae0a42aa20c673bb0

packages/react-native/scripts/ios-prebuild/utils.js

@@ -0,0 +1,29 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ * @format
+ * @oncall react_native
+ */
+
+const fs = require('fs');
+
+/**
+ * Creates a folder if it does not exist
+ * @param {string} folderPath - The path to the folder
+ * @returns {string} The path to the created or existing folder
+ */
+function createFolderIfNotExists(folderPath /*:string*/) /*: string*/ {
+  if (!fs.existsSync(folderPath)) {
+    fs.mkdirSync(folderPath, {recursive: true});
+    if (!fs.existsSync(folderPath)) {
+      throw new Error(`Failed to create folder: ${folderPath}`);
+    }
+  }
+  return folderPath;
+}
+
+module.exports = {createFolderIfNotExists};