Geo - Whitelist LFS requests to download objects on a secondary node

What does this MR do?

Whitelist the LFS route to download LFS objects in bulk on Geo read-only middleware.

Are there points in the code the reviewer needs to double check?

No.

Why was this MR needed?

Git LFS can't download files from Geo secondary node due to read-only middleware.

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• API support added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Closes #3232 (closed)