Revert "[MM-8497] Ability to set Do Not Disturb for a specified period of time (#16067)" (#17657)

This reverts commit 77d42568f9.

store/timerlayer/timerlayer.go

@@ -6888,22 +6888,6 @@ func (s *TimerLayerStatusStore) SaveOrUpdate(status *model.Status) error {
 	return err
 }
 
-func (s *TimerLayerStatusStore) UpdateExpiredDNDStatuses() ([]*model.Status, error) {
-	start := timemodule.Now()
-
-	result, err := s.StatusStore.UpdateExpiredDNDStatuses()
-
-	elapsed := float64(timemodule.Since(start)) / float64(timemodule.Second)
-	if s.Root.Metrics != nil {
-		success := "false"
-		if err == nil {
-			success = "true"
-		}
-		s.Root.Metrics.ObserveStoreMethodDuration("StatusStore.UpdateExpiredDNDStatuses", success, elapsed)
-	}
-	return result, err
-}
-
 func (s *TimerLayerStatusStore) UpdateLastActivityAt(userID string, lastActivityAt int64) error {
 	start := timemodule.Now()