misc(error-reporting): report unhandled promise rejections (#3886)
misc(error-reporting): report unhandled promise rejections (#3886)


GoogleChrome/lighthouse,deepanjanroy/lighthouse,umaar/lighthouse,mixed/lighthouse,tkadlec/lighthouse,wardpeet/lighthouse,deepanjanroy/lighthouse,GoogleChrome/lighthouse,deepanjanroy/lighthouse,mixed/lighthouse,wardpeet/lighthouse,ev1stensberg/lighthouse,tkadlec/lighthouse,mixed/lighthouse,tkadlec/lighthouse,wardpeet/lighthouse,umaar/lighthouse,mixed/lighthouse,wardpeet/lighthouse,umaar/lighthouse,umaar/lighthouse,GoogleChrome/lighthouse,tkadlec/lighthouse,wardpeet/lighthouse,GoogleChrome/lighthouse,ev1stensberg/lighthouse,ev1stensberg/lighthouse,GoogleChrome/lighthouse,deepanjanroy/lighthouse,deepanjanroy/lighthouse,ev1stensberg/lighthouse