Make `SystraceRequestListener` internal (#49107)

Summary:
As part of the initiative to reduce the public API surface, this class can be internalized. I've checked there are [no relevant OSS usages](https://github.com/search?type=code&q=NOT+is%3Afork+NOT+org%3Afacebook+NOT+repo%3Areact-native-tvos%2Freact-native-tvos+NOT+repo%3Anuagoz%2Freact-native+NOT+repo%3A2lambda123%2Freact-native+NOT+repo%3Abeanchips%2Ffacebookreactnative+NOT+repo%3AfabOnReact%2Freact-native-notes+NOT+user%3Ahuntie+com.facebook.react.modules.fresco.SystraceRequestListener).

## Changelog:

[INTERNAL] - Make com.facebook.react.modules.fresco.SystraceRequestListener internal

Pull Request resolved: https://github.com/facebook/react-native/pull/49107

Test Plan:
```bash
yarn test-android
yarn android
```

Reviewed By: cortinico

Differential Revision: D69046100

Pulled By: javache

fbshipit-source-id: 0cb4c6eda385f458c3e4b02068ce77f2dd15af23