refs https://linear.app/tryghost/issue/CORE-104/decouple-frontend-routing-events-from-urlserver-events
- The 'settings.timezone.edited' event triggers a roundtrip chain of calls in the frontend routing to the url services. It was all handled by event listeners and handler that clearly don't belong there.
- Extracted event realted listeners/handlers into methods and moved most of the logic to the "bootstrap" module, which soon is going to become a "RoutesManger"
- The result of this refactor - no more events going back and forth between frontend routing and the backend!
- this is a small part of a bit of cleanup of our test files
- the goal is to make the existing tests clearer with a view to making it easier to write more tests
- this makes the test structure follow the codebase structure more closely
- eventually we will colocate the frontend tests with the frontend code
