don't show loading spinners for server-rendered sidebar fields

What does this MR do?

Don't show loading spinners when there is server-rendered data

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

Tests needed for this?

Why was this MR needed?

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• Changelog entry added
• 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 #24683 (closed)