Item view: don't do a zoom animation

The zoom animation in all 3 views looks very glitchy,
because icons that were already in view animate, those that weren't
don't animate giving weird effect.
In the list view mode, the tree view branches don't animate either,
showing weird holes between the branches

Also, while zooming in and out very quickly, is possible to
have the selection rectangle somehow unsynced with the items sizes
leading to visual glitches.

Without an animation, zooming the view feels much faster and robust
giving immediate feedback when zooming via ctrl+scroll or by dragging
the slider around

BUG:510426

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