WIP: Resolve "Preview PDFs"

What does this MR do?

• Render only PDFs below a max file size
• Provide option to download or display (render) PDFs above max file size

Why was this MR needed?

• Performance issues eating up RAM when rendering large PDFs

Screenshots (if relevant)

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 #19360 (closed)