Toggle whitespace button for compare page

What does this MR do?

Adds whitespace button to compare branches page.

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

Ruby code.

Why was this MR needed?

Compare branches UX

What are the relevant issue numbers?

Closes #17881 (closed).

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 style guides
• Branch has no merge conflicts with master (if you do - rebase it please)
• Squashed related commits together