- Adds animation when opening & closing the sidebar
- Adds an animation when dragging boards to a new position
- Adds animations to dragging issues around
When opening the sidebar it will also animate the scrollLeft property to
make moving to the opened issue less blunt.
Closes#25630
Rather than constructing & then deconstructing, we know just hide & show
the sidebar. This is done so we dont' have a memory leak on the frontend
with objects getting created.
