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

This reverts commit 77d42568f9.

store/retrylayer/retrylayer.go

@@ -8296,26 +8296,6 @@ func (s *RetryLayerStatusStore) SaveOrUpdate(status *model.Status) error {
 
 }
 
-func (s *RetryLayerStatusStore) UpdateExpiredDNDStatuses() ([]*model.Status, error) {
-
-	tries := 0
-	for {
-		result, err := s.StatusStore.UpdateExpiredDNDStatuses()
-		if err == nil {
-			return result, nil
-		}
-		if !isRepeatableError(err) {
-			return result, err
-		}
-		tries++
-		if tries >= 3 {
-			err = errors.Wrap(err, "giving up after 3 consecutive repeatable transaction failures")
-			return result, err
-		}
-	}
-
-}
-
 func (s *RetryLayerStatusStore) UpdateLastActivityAt(userID string, lastActivityAt int64) error {
 
 	tries := 0