@runspired can we get a review also for this one?

@runspired I don't really understand why tests are failing on master. Preston mentioned it might pick up wrong version of test helpers.

The reason why it was still using v3.x of test-helper is, that there is a override in package.json and a patch for v3... Its not so nice to make a patch for a active addon which is provided from ember team.

I have now created a new patch for test-helper v4 and updated on all points to v4.

After this change, we were running into ember-cli-fastboot-testing error with test-helper, because there is missing the peerDependency (opend a issue embermap/ember-cli-fastboot-testing#872)

Preston has told me, that its possible fixed with updating all @embroider & auto-import versions to latest, but it wasn't... so i have added a patch for now

ember-cli-fastboot-testing has added now peerDependency of @ember/test-helper. Patching ember-cli-fastboot-testing is now not anymore necessary (already changes in this PR)