[hotfix] legacy-osffiles-api-routes

Handle legacy OSFFiles API `/api/v1` routes for `download_file` and `download_file_by_version`.

Tests to validate legacy url's redirect to new storage platform.

Relates to #226 

```python
[
    # Legacy routes for `download_file`
    '/project/<pid>/osffiles/<fid>/',
    '/project/<pid>/node/<nid>/osffiles/<fid>/',
    '/project/<pid>/files/download/<fid>/',
    '/project/<pid>/node/<nid>/files/download/<fid>/',

    # Legacy routes for `download_file_by_version`
    '/project/<pid>/osffiles/<fid>/version/<vid>/',
    '/project/<pid>/node/<nid>/osffiles/<fid>/version/<vid>/',
    '/project/<pid>/files/download/<fid>/version/<vid>/',
    '/project/<pid>/node/<nid>/files/download/<fid>/version/<vid>/',
],
```