refs https://github.com/TryGhost/Ghost/issues/14101
refs https://github.com/TryGhost/Team/issues/1734
- use of the helper was generating deprecation warnings when building Admin
- removed the single usage in favor of using `{{perform}}` directly on a controller task property as there was no need to go via the route
- changed naming of task properties to include a `...Task` suffix so it's clear when dealing with a task object
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
- 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()`
