Added tests for WizardFactories class and for StyleModel class.
Task-number: QDS-5690
Change-Id: I08f51c2b6cf628a265286ddb8056bd049a64ff0b
Reviewed-by: Marco Bubke <marco.bubke@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>
