MM-55524: Include deactivated users in DM export (#25695)

We were incorrectly excluding deactivated users
while getting channel members for a DM channel, whereas
we were actually exporting all users in the users array.

We fix this and also correctly honor the includeArchivedChannels
flag as well.

https://mattermost.atlassian.net/browse/MM-55524

```release-note
Include deactivated members in a favorited DM channel export.
```


---------

Co-authored-by: Mattermost Build <build@mattermost.com>

server/channels/store/retrylayer/retrylayer.go

@@ -1175,11 +1175,11 @@ func (s *RetryLayerChannelStore) GetAllChannelsForExportAfter(limit int, afterID
 
 }
 
-func (s *RetryLayerChannelStore) GetAllDirectChannelsForExportAfter(limit int, afterID string) ([]*model.DirectChannelForExport, error) {
+func (s *RetryLayerChannelStore) GetAllDirectChannelsForExportAfter(limit int, afterID string, includeArchivedChannels bool) ([]*model.DirectChannelForExport, error) {
 
 	tries := 0
 	for {
-		result, err := s.ChannelStore.GetAllDirectChannelsForExportAfter(limit, afterID)
+		result, err := s.ChannelStore.GetAllDirectChannelsForExportAfter(limit, afterID, includeArchivedChannels)
 		if err == nil {
 			return result, nil
 		}