Move Core Data tests out of the Library package so that we can still use
the more efficient `swift test` for most tests.
Create a PassepartoutTests target only for tests that require
`xcodebuild`, like Core Data tests.
Eventually:
- PRs only run SwiftPM tests
- Releases run ALL tests with `scan` before `gym`
Split AppUI into AppUI and AppUIMain to allow for a new, simplified
AppUITV target tailored for the Apple TV.
As a PoC, present a view with a list of the shared profiles.
