refs https://github.com/TryGhost/Product/issues/3832
---
### <samp>🤖 Generated by Copilot at 7a91ba3</samp>
This pull request enables data synchronization between the Ember app and
the React app for the settings module. It passes `onUpdate` and
`onInvalidate` functions as props from the Ember app to the React app
through the `ReactApp` component and the `ServicesContext`. It also
removes unused code and adds some debugging logs in the `setting`
serializer and the `settings` service.