tests: fix and un-blacklist tst_qgraphicsview::hoverLeave

Tests should not use QCursor to emulate mouse move, see QCursor::setPos() docs.

The flakiness of the test on XCB is not surprising when the test queries geometry
even before the window has been shown. With the re-factored version I could not
reproduce flakiness anymore.

Removed Q_OS_MAC and closed QTBUG-26274 as test passes on macOS from which I
assume that the underlying issue has been fixed.

Removed Q_OS_QNX ifdef as test does not rely on QCursor anymore.

This patch also fixes the issues on minimal / offscreen platform plugins.
QCursor::setPos() is evil for auto test purposes.

Note:

We intentionally use QTest::mouseMove(QWindow *window, ..), not the QWidget overload.
The QWindow version gets routed through QWSI, which ensures that all necessary events
are generated as expect. In QWidget code path this is currently disabled by
QTEST_QPA_MOUSE_HANDLING.

Change-Id: I285c26cff09e3f2750f8c2abbb1f46c8f7be984a
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>

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