Fix memory leak in some plasma components

A few plasma components cache QSGTexture. Those components rely on
texture references going away with QSGNode users. However, with the
current tear down logic, OffscreenQuickView won't destroy any paint
nodes.

Destroy QQuickRenderControl before QQuickWindow to ensure that are no
paint nodes left alive after OffscreenQuickView.

BUG: 444429
BUG: 444381
BUG: 444077
BUG: 444306
(cherry picked from commit 64f2cdf9)