Simplify BisectFormatter using `example_finished` notification.
Created by: myronmarston
We did not offer it when the BisectFormatter was written but it nicely simplifies it now.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Created by: myronmarston
We did not offer it when the BisectFormatter was written but it nicely simplifies it now.