Summary:
- When opening HelpScout beacon to an article ("answers"), avoid a 'navigate'
call to let the beacon show the previously open article.
- Work around a bug with reloading a page with a beacon article open: HelpScout
renders the last state without triggering usual events.
- Report errors to server when beacon fails to load.
- reportWarning() method now reports the message to the server.
Test Plan: Added a test case
Reviewers: paulfitz
Reviewed By: paulfitz
Differential Revision: https://phab.getgrist.com/D3345