Bug 1682076 - [remote] Add favicon.ico for Puppeteer unit tests. r=re…

…mote-protocol-reviewers,jdescottes

Temporarily add a favicon to fix Puppeteer tests relying on a proper set of console log messages. It's the same favicon as used in puppeteer/puppeteer#6868 which will land post Puppeteer 7.0.4.

Differential Revision: https://phabricator.services.mozilla.com/D104809