Stabilize tst_QWidget::optimizedResizeMove and optimizedResize_topLevel

The test functions tst_QWidget::optimizedResizeMove and
tst_QWidget::optimizedResize_topLevel use a custom widget to record
paint events in a boolean.
Using QTRY_* or qWait() to wait for the boolean to become true stops
event processing upon consumption of the first paint event.
In case of multiple paint events, the next paint event will be recorded
in the next check and may lead to a wrong result.
This leads to flakiness on platforms generating multiple paint events,
openSuSE Leap 15.4 / XCB being one of them.

This patch replaces the boolean with a counter. It adds a
waitForPaintEvents method to the custom class, which processes events,
until the counter stops increasing. It returns true when paint events
have been recorded and false otherwise. It resets the counter after
each call.

It also removes the QSKIP on wayland, as the failure results from the
same reason.

Fixes: QTBUG-109093
Pick-to: 6.4
Change-Id: I59ee8bb4efeaf5417d5749d21e384bee89301ae0
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>

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