Allow @ember/test-helpers v4 as peerDependency

[mkszepp]

This PR allows consumer apps also @ember/test-helpers v4 version (test-helper is now a v2 addon)

[mkszepp]

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

[Baltazore]

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

[mkszepp]

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

[mkszepp]

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)

[mkszepp]

Opened a PR in ember-provide-consume-context for test-helpers v4...

While we wait for patch, i have added under peerDependencyRules -> allowAny the rule for @ember/test-helpers.

This helps us may be to get green ci

[Baltazore]

@mkszepp thank you for working on that ! ❤️

[mkszepp]

ember-provide-consume-context supports now also v4.0.0 of test-helpers... now all packages are supporting v3 and v4 of test-helpers

For test-helpers there is now no override anymore necessary. Only the patches are still needed like there were before.

@Baltazore @runspired can we get a review and release with this changes?

[runspired]

overall seems good, little bit of cleanup to do