[8.x] Raise ScheduledBackgroundTaskFinished event to signal when a run in background task finishes #37377
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PR #29888 added excellent new events ScheduledTaskStarting and ScheduledTaskFinished which are fired before and after a scheduled task runs.
However, where the scheduled task is set to run in background, ScheduledTaskFinished fires immediately because we push the task off to a separate process. This makes it difficult to run any relevant activities after a background task finishes, without having to hack on to the after callbacks.
This PR adds a new event ScheduledBackgroundTaskFinished which we fire within the schedule:finish command which allows us to reliably determine when a background task actually completed without having to attach after callbacks to each scheduled task.
We're adding a brand new event class and firing it without changing any additional functionality so should not be a breaking change. (See discussion on original 8.x PR #37367 and 9.x/master PR #37373)