refs https://github.com/TryGhost/Ghost/issues/13837
- a [refactor](9fa8800b9d) in `@tryghost/bootstrap-socket` changed the signature of the method it exprots, but the use of this
library wasn't updated in Ghost
- therefore, the library was trying to send the `@tryghost/logging` library, which caused
errors with Ghost-CLI down the line, as mentioned in the issue
- this commit updates the method signature to match what is expected
- In the old boot the server wasn't started til we were ready
- In new boot, we start the server immediately and send the old started event
- Then, when we are ready to accept some traffic, we send a ready event
- At the moment, ready isn't quite sent at the right time:
- It _should_ be when we're ready to serve real traffic, not just send 503s
- This is after the URL generation has finished
- But this requires more refactoring work :(
- So for now we send when everything else is ready
- This really needs some tests
