dillon1000/react

Better detection for reanimated

We found this issue through enabling the compiler on the React Conf app.

`babel-preset-expo` automatically adds the `react-native-animated`
plugin to apps that use the preset. This means that Expo apps sometimes
omit the react-native-animated plugin from their config, which was
failing our existing check. This PR copies the same detection that Expo
does for adding reanimated as a fallback

ghstack-source-id: 46f7aec0bc3035a92369f65b0842bafab0089a9e
Pull Request resolved: https://github.com/facebook/react-forget/pull/2953