Remove useRefEffect (#58451)

Summary:
Pull Request resolved: https://github.com/react/react-native/pull/58451

React 19 now supports this natively by returning a cleanup callback from the ref setter.

The only caveat is that if a ref handler throws, the runtime will still invoke the ref setter with null on unmount.

Changelog: [Internal]

Reviewed By: zeyap

Differential Revision: D114349280

fbshipit-source-id: 93fb5fb2ded37c0ecc3f803bb558b9e977303b05