Ember 6.8 compatibility

[felixbuenemann]

Patches the folllowing deprecation warnings:

• deprecate-import-onerror-from-ember
• importing-inject-from-ember-service
• deprecate-import-view-utils-from-ember

[felixbuenemann]

I don't know how to write a version of the code that supports both import { service } from '@ember/service' and import { inject as service } from '@ember/service' at the same time. Maybe one of the maintainers has an answer.

[felixbuenemann]

One option would be to only keep the deprecate-import-view-utils-from-ember deprecation fix, which fixes the deprecation message in the browser that can't be silenced by app/deprecation-workflow.js and rely on that for the other two deprecations for now.

[felixbuenemann]

I added the import * as serviceModule from '@ember/service' workaround to support older Ember.js versions, as suggested by @SergeAstapov, but now the packaging tests fail with:

Using import * as serviceModule from '@ember/service' is not supported.

I'm not sure what to do about that other than dropping support for older Ember.js versions.