Navigator.dismiss(payload) does not provide payload to Promise<NavigationResult>

When calling `dismiss(payload)`, the payload object is never available as a return value to the `Navigator.present` Promise.

```js
// screen_a.js
Navigator.present(SCREEN_B).then(result => {
console.info(result)
// { code: -1 }
})

// screen_b.js
Navigator.dismiss({ success: true })
```

No matter what I provide to `dismiss`, all I ever get is the `NavigationResult` code and never a `payload` key.

Is this feature not yet functioning or am I missing something from the [docs](https://github.com/airbnb/native-navigation/blob/6654f4e9d9038a02ac1575951ea31046daf14313/docs/api/navigator/dismiss.md)?

Start with docs/api/navigator/dismiss.md and the Navigator.present/dismiss entry points described in the issue. Trace how dismiss(payload) reaches the present Promise and verify that the completed result exposes the payload alongside the NavigationResult code.

Written by the indexing model from the issue text.