[lint] Remove experimental gating useEffectEvent rules (#34660)

Stacked on https://github.com/facebook/react/pull/34637

`useEffectEvent` is now in canary so we need to remove this
`__EXPERIMENTAL__` gating on the rules and tests

DiffTrain build for [57b16e37887b324e4a077fd302b805d63421b695](https://github.com/facebook/react/commit/57b16e37887b324e4a077fd302b805d63421b695)