Restore flow dir in react-native package files (#52735)

Summary:
Pull Request resolved: #52735

Changelog: [Internal] (Follow up to keep #50784 non-breaking)

Reviewed By: cortinico

Differential Revision: D78662770

fbshipit-source-id: 03d931c904c0092481dbd03e8420244639305610

Author: huntie

packages/react-native/package.json

@@ -78,6 +78,7 @@
   "files": [
     "build.gradle.kts",
     "cli.js",
+    "flow",
     "gradle.properties",
     "gradle/libs.versions.toml",
     "index.js",