`@react-native/tester` should be private (#34570)

Summary:
Made `react-native/tester` private.

## Changelog

[Internal] [Fixed] - Made `react-native/tester` private

Pull Request resolved: https://github.com/facebook/react-native/pull/34570

Test Plan: n/a

Reviewed By: lunaleaps

Differential Revision: D39235797

Pulled By: cortinico

fbshipit-source-id: d5dee20f1ddfc198b3a776464a91de470ce824f6

packages/rn-tester/package.json

@@ -1,4 +1,5 @@
 {
+  "private": true,
   "name": "@react-native/tester",
   "version": "0.0.1",
   "license": "MIT",
@@ -16,7 +17,7 @@
     "clean-android": "rm -rf android/app/build",
     "setup-ios-jsc": "bundle install && USE_HERMES=0 bundle exec pod install",
     "setup-ios-hermes": "bundle install && USE_HERMES=1 bundle exec pod install",
-    "clean-ios": "rm -rf build/generated/ios && rm -rf Pods && rm Podfile.lock"
+    "clean-ios": "rm -rf build/generated/ios Pods Podfile.lock"
   },
   "dependencies": {
     "invariant": "^2.2.4",