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

janicduplessis/react-native,javache/react-native,facebook/react-native,javache/react-native,javache/react-native,facebook/react-native,janicduplessis/react-native,javache/react-native,javache/react-native,javache/react-native,facebook/react-native,javache/react-native,facebook/react-native,facebook/react-native,javache/react-native,janicduplessis/react-native,janicduplessis/react-native,facebook/react-native,facebook/react-native,janicduplessis/react-native,javache/react-native,facebook/react-native,facebook/react-native,janicduplessis/react-native,janicduplessis/react-native,janicduplessis/react-native