MM-53747: Create job to encode older image paths (#24073)

Bifrost now encodes all image paths. Due to this
one-way translation, we need to encode all the older
image paths as well.

After this is done, we can remove the double-lookup.

https://mattermost.atlassian.net/browse/MM-53747

```release-note
NONE
```

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

server/channels/store/timerlayer/timerlayer.go

@@ -3303,10 +3303,10 @@ func (s *TimerLayerFileInfoStore) GetByPath(path string) (*model.FileInfo, error
 	return result, err
 }
 
-func (s *TimerLayerFileInfoStore) GetFilesBatchForIndexing(startTime int64, startFileID string, limit int) ([]*model.FileForIndexing, error) {
+func (s *TimerLayerFileInfoStore) GetFilesBatchForIndexing(startTime int64, startFileID string, includeDeleted bool, limit int) ([]*model.FileForIndexing, error) {
 	start := time.Now()
 
-	result, err := s.FileInfoStore.GetFilesBatchForIndexing(startTime, startFileID, limit)
+	result, err := s.FileInfoStore.GetFilesBatchForIndexing(startTime, startFileID, includeDeleted, limit)
 
 	elapsed := float64(time.Since(start)) / float64(time.Second)
 	if s.Root.Metrics != nil {