Bump useEffectEvent to Canary (#34610)

Bumps `useEffectEvent` from `@experimental` to `@canary`. Removes the
`experimental_` prefix from the export.

## TODO
- [ ] Update useEffectEvent reference page and Canary badging in docs:
https://github.com/reactjs/react.dev/pull/8025

DiffTrain build for [8bb7241f4c773376893701bfe8b8ff03687342a0](https://github.com/facebook/react/commit/8bb7241f4c773376893701bfe8b8ff03687342a0)