fix(cdk/scrolling): unsubscribe from scrolled stream when viewport is destroyed #27800
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Initially the virtual scroll viewport was written under the assumption that it is the scrollable and that it doesn't need to unsubscribe from its
elementScrolled
stream, because it'll be completed on destroy. This might not be the case if aCdkVirtualScrollableElement
is provided and the viewport might be destroyed without the scrollable being destroyed.These changes add a
takeUntil
to avoid any potential leaks.Fixes #27799.