refs. https://github.com/TryGhost/Product/issues/3949
- the User detail modal class structure was way overcomplicated
- the top part of the outline highlight of a setting group which is first in a section was cut
- toggle label style was inconsisten in Newsletter settings
- Audience feedback was not enabled by default when creating a Newsletter
- the whole UI was using Twitter, instead of "X"
refs https://github.com/TryGhost/Product/issues/3349
- Simplified a few more places after switching to react-query
- Improved how mocking works in specs to be more scalable as the number
of queries increases
