refs https://linear.app/tryghost/issue/CORE-104/decouple-frontend-routing-events-from-urlserver-events
- The "bootstrap" didn't give enough credit to everything this module was doing - it's responsible for managing correct initialization and reinitialization of the frontend Routes as well as passing router creation information back to the frontend's URL service
- The refactor is done in two steps - the "bootstrap.js" will be renamed in the follow-up commit to have a clean history of how the file evolved
refs https://linear.app/tryghost/issue/CORE-103/decouple-internal-frontend-code-from-url-module
- We need to decouple all frontend services from URL service as much as possible. "bootstrap" module is now a central point to substitute (proxy really) function previously done by the URL service and this move changes direct usage of URL service to "bootstraps" internal proxy function
- 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
