This unifies logging across the backend to always use the Logger class,
always only logs to stdout (rather than an inconsistent mix of stdout
and stderr, depending on whether console.error was used), and removes
logging where two log events happened for the same message
For example, this pattern:
```js
Logger.error("Whoops, something went wrong:")
console.error(err)
```
That causes two separate log events, and depending on the log transport
used, could cause relevant log messages to get split across multiple
events and therefore be harder (usually just more tedious) to connect
and debug in production environments.
