List View: Subtle visual issues with displacement dragging

[andrewserong]

Part of #49563 and related to #56539

In WordPress 6.5, the list view drag and drop behaviour was updated to introduce the idea of displacing list view items while dragging (implemented in #56625). The current implementation has a couple of wrinkles or subtle visual issues:

• When dragging a block from a position to another, the list animates smoothly excepts the block being dragged, you see a quick "jump" to the new position
• When dropping the block, the positions are already correct but you still see an unnecessary animation

(Kudos @youknowriad for flagging these)

Here is a quick demo of the current state:

2024-03-18.11.06.47.mp4

My hunch is that the best path forward is likely to roll in fixes for these issues as part of the work in resolving #56539 (making the drag chip resemble the list view item). I have an earlier WIP PR exploring this over in #58103 — I'm hoping to either dust off that PR or begin a new one for the WP 6.6 cycle, but don't let that stop anyone, if anyone would like to jump in and explore ideas for this in the meantime.