Add uncaught errors to support logs

[mattrunyon]

Right now, if the JS API throws an error, it might be uncaught and those don't seem to get added to the support logs because they bypass console.error. We should probably add a window level listener for uncaught errors and add them to the support logs

[mofojed]

Details on adding a window level listener for unhandled promise rejections: https://developer.mozilla.org/en-US/docs/Web/API/Window/unhandledrejection_event
And for error events: https://developer.mozilla.org/en-US/docs/Web/API/Window/error_event
Note that LogProxy already handles uncaught errors, so we just need to add the unhandled rejections listener similarly.