Remove xml from report_results_spec
It looks like we don't need to keep references to xml files/formats in the report_results_spec since we now use json files.
Context: I was trying to have the report_results script add a label for the quarantine type from the test report but quarantine information is not included in xml files so the report_results_spec fails even though the new functionality works with the json files we currently use.
/cc @mlapierre am I missing where we're still using xml for reporting results or am I good to clean up this spec?
Edited by Désirée Chevalier