Having this set to ALL pollutes the JS system spec
logs with a bunch of unnecessary noise like this:
> "PresenceChannel '/chat-user/core/1' dropped message (received 315, expecting 246), resyncing..."
Or:
> "DEPRECATION: The \u003Cdiscourse@component:plugin-connector::ember1112>#save computed property was just overridden. This removes the computed property and replaces it with a plain value, and has been deprecated.
Now, we will only log errors. To configure this set
the `SELENIUM_BROWSER_LOG_LEVEL` env var.