Remove `Clusters::Applications::ScheduleUpdateService`

The following discussion from !86203 (merged) should be addressed:

• @syasonik started a discussion: (+1 comment)

  thought: Should this MR remove Clusters::Applications::ScheduleUpdateService as well, since it removes all the usages?

  Judging from the deprecation notices in each file, it seems like ScheduleUpdateService / ClusterUpdateAppWorker might be where the line is drawn between grouprespond & ~"group::configure"?

  I could see this opening a can of worms, though. So definitely non-blocking.