LFS: Serve pre-signed URLs in `/lfs/objects/batch`

What does this MR do and why?

LFS: Serve pre-signed URLs in /lfs/objects/batch

The /lfs/objects/batch does serve all LFS objects today via GitLab. This is redundant when LFS is to be downloaded directly from OS.

This changes the /lfs/objects/batch to prefer presigned URLs in such cases.

References

• LFS: The `batch request` for download should pr... (#413684 - closed)

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