refs https://github.com/TryGhost/Ghost/issues/15008
- Backup process had a slim benefit to keep around. Without it the removal process is much smoother.
- The backup still happens on the server side if it's absolutely needed at some point in the future
no issue
- ran [ember-native-class-codemod](https://github.com/ember-codemods/ember-native-class-codemod) to convert the majority of remaining EmberObject based controllers and components to native class syntax using the `@classic` decorator
- skipped older style modal components (`components/modal-*.js`) due to observed incompatibilities in some cases
No issue
- Authors don't need access to staff page and don't need to see breadcrumbs on their profile page
- There's enough space in the side navigation for the post views to be visible by default
no issue
- part of ember upgrades
- removed all unnecessary usage of `.get`
- cleaned up imports where we had imports from the same module across multiple lines
- standardized on importing specific computed helpers rather than using `computed.foo`
- switched tests from using `wait()` to `settled()`
