Expand/collapse button -> Change to make it look like a toggle

What does this MR do?

Changes the expand/collapse button to look different when is opened/closed

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

Why was this MR needed?

In order to handle issue #28575 (closed)

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 #28575 (closed)