refs: https://github.com/TryGhost/Toolbox/issues/245
- The destroy endpoint was missing a serializer
- Instead of adding one, we've refactored to use the standard structure for this serializer
- Updated the tests to prove the body doesn't change
refs https://github.com/TryGhost/Toolbox/issues/135
- Going though local utils allows to have the "withFrontend: false" flag applied only to the e2e-api test suites. This way we can gradually introduce the no-frontend change across all test suites