Fix CI for Ember 4 - Githubissues

Add ember-auto-import when needed
Update ember-cli-htmlbars (< 5 uses registerPlugin which is removed in 4)
Migrate to functional style AST transform (class based system is removed in 4)
Refactor Ember.inject.service monkey patch (window.Ember is not present in 4)
Migrate to current ember-qunit setup (ember-cli-qunit uses a number of removed APIs)
Update to ember-cli@3.28 (fixes an issue with window.Ember missing)

rwjblue / ember-holy-futuristic-template-namespacing-batman