Stabilize tst_qgraphicsitem and tst_qgraphicsview

Add qWaitForWindowExposed() calls in addition to the
existing qWaitForWindowActive().

Depending on the platform, window activation events may
be synchronous, which means that a window can (and will)
become active before it becomes exposed.

This causes test failures for tests that count paint
event, and does not wait-for-exposed, when the expose/paint
event is delivered after waitForWindowActive() has returned.

We need to keep the waitForWindowActive() as well: the
test has several qWait() calls with he comment:
  “Increase the probability of window activation not
   causing another repaint of test items”.
These qWait() calls can possibly be removed in a future
commit.

Task-number: QTBUG-66536
Task-number: QTBUG-61967
Change-Id: Ie61bba058b583fdd1d80e600475aff3efccc32eb
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>

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