Added animations to issue boards

What does this MR do?

Animates all the things on issue boards!

• Animates the opening & closing of the sidebar
  • also animates the scrollLeft of the boards list if the issue isn't fully visible
• Animates dragging lists around
• Animates dragging issue cards around

Screenshots (if relevant)

What are the relevant issue numbers?

Closes #25630 (closed)