Add QQuickWidget to display the list of errors. Previously, a QListView
was used for this purpose. Introduce ErrorListView.qml file, which
includes a ListView using the ErrorListModel.
Pick-to: 6.8
Change-Id: I221b347e14305338219f5d8e8d2994497a0f20f5
Reviewed-by: Oliver Eftevaag <oliver.eftevaag@qt.io>