Fix design note scrolling

What does this MR do?

This MR allows all users to scroll to the selected discussion. Also, it fixes a small regression where scrolling was only possible when resolved discussions are visible.

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers
• Informed Infrastructure department of a default or new setting change, if applicable per definition of done