This makes accessing LFS Objects for a project easier project.lfs_storage_project.lfs_objects` becomes project.all_lfs_objects This will make the refactor in https://gitlab.com/gitlab-org/gitlab-ce/issues/39769 easier to deal with.
Downloading the stream directly to the archive. In order to avoid conflicts with the cache.
If the LFS object already exist, we'll link it tot he existing one, if not we'll create it.
The LFS files will be included in the `lfs-objects` directory in the archive.
