Ensure that appformer-js test results are being published as xunit reports

This is mandatory for CI integration and also for QE. QE needs to be able to import test results into Polarion tool.
QE also need to be able to execute appformer-js tests on different platforms.
Goal of this tasks is to make sure that we can do this - implement this functionality if needed.
Tasks is done when polarion has community tests of appformer-js imported.