Annotate allProject-scoped services with the appropriate service scopes, and require any new services to be properly annotated.

Follow-up for #31990

The changes are across many files but they are mostly trivial and of two types:

• Add a missing @ServiceScope annotation to the service interface/class
• Update service registration by exposing only the service interface, instead of the service implementation

The latter is done either by updating the returned type from a factory method or by adding an explicit service type in the registration.add() call.