To better test the light mode/color famlies on web, I wanted to create an interface to make it easy to toggle between light mode and dark mode. Since this will be longer work in progress process, I wanted to gate this interface so only Comm staff can see it. As a first step to this, I want to lift useIsCurrentUserStaff into lib so web can use this hook too

flow and confirmed that useIsCurrentUserStaff still returns the same value as it did when it lived in native