test: report ERROR wpt test results

When a wpt test file is exited for uncaught error, its result should be recorded in the wptreport.json and uploaded to wpt.fyi.

For instance, html/webappapis/timers/evil-spec-example.any.js is exited for uncaught error in Node.js but it shows as "MISSING" at https://wpt.fyi/results/html/webappapis/timers?label=master&label=experimental&product=chrome&product=node.js&aligned.