MM-61484 - Deleting scheduled posts when permanently deleting a user (#29152)

* Deleting scheduled posts when permanently deleting a user

* Updated tests

* CI

* Testing CI

* Restored a test change

* Skipping flaky test

server/channels/store/retrylayer/retrylayer.go

@@ -9912,6 +9912,27 @@ func (s *RetryLayerScheduledPostStore) GetScheduledPostsForUser(userId string, t
 
 }
 
+func (s *RetryLayerScheduledPostStore) PermanentDeleteByUser(userId string) error {
+
+	tries := 0
+	for {
+		err := s.ScheduledPostStore.PermanentDeleteByUser(userId)
+		if err == nil {
+			return nil
+		}
+		if !isRepeatableError(err) {
+			return err
+		}
+		tries++
+		if tries >= 3 {
+			err = errors.Wrap(err, "giving up after 3 consecutive repeatable transaction failures")
+			return err
+		}
+		timepkg.Sleep(100 * timepkg.Millisecond)
+	}
+
+}
+
 func (s *RetryLayerScheduledPostStore) PermanentlyDeleteScheduledPosts(scheduledPostIDs []string) error {
 
 	tries := 0