[DevTools] Don't hide overflow rectangles (#34852)

I get the wish to click the shadow but not all child boundaries are
within the bounds of the outer Suspense boundary's node.

Sometimes they overflow naturally and if we make it overflow hidden we
hide the boundaries. Maybe it would be ok if they're actually clipped by
the real DOM but right now it covers up boundaries that should be there.

Additionally, there's also a common case where the parent boundary
shrinks when suspending the children. That then causes the suspended
child boundaries to be clipped so that you can't restore them. Maybe the
virtual boundary shouldn't shrink in this case.