[macOS] Hover events are not received if the parent of the QWindow is embedded

The probably cause of this is the commit which fixes QTBUG-103084.

In a case where QWindows is embedded into foreign window and QML gets loaded into a QQuickView, which has as a parent a QWindow which gets created from a foreign window by using QWindow::fromWinId. So eventhough the window is embedded, m_platformWindow->isEmbedded() returns false in this case.

This could be potentially fixed by making QCocoaWindow::isEmbedded() to return true if window()->parent() is a foreign window.