Follow up to #2401
Created by: JonRowe
Move the logic for detecting files vs streams back to formatter loader, this restores the deprecation stream behaviour and simplifies config.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Created by: JonRowe
Move the logic for detecting files vs streams back to formatter loader, this restores the deprecation stream behaviour and simplifies config.