effects/fallapart: Avoid animating windows while there's a fullscreen effect

Vlad Zahorodnii requested to merge work/zzag/fallapart-in-overview into master

While there's a fullscreen effect, the fall apart effect should avoid animating windows as it can corrupt or interfere with the active full screen effect. This matches behavior of many other animation effects in kwin.

BUG: 449844

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