Support for ember 5

[jacobnlsn]

Full disclosure, looked very little into this. I am new to ember and just having issues going through the quick start guide, so spent some time trying to figure out why.

With ember-cli 5 getting released as latest the quick start guide is failing on ember new ember-quickstart --lang en

npm ERR! code ERESOLVE
npm ERR! ERESOLVE unable to resolve dependency tree
npm ERR! 
npm ERR! While resolving: [email protected]
npm ERR! Found: [email protected]
npm ERR! node_modules/ember-source
npm ERR!   dev ember-source@"~5.0.0" from the root project
npm ERR! 
npm ERR! Could not resolve dependency:
npm ERR! peer ember-source@"^3.28.0 || ^4.0.0" from [email protected]
npm ERR! node_modules/ember-cli-app-version
npm ERR!   dev ember-cli-app-version@"^6.0.0" from the root project
npm ERR! 
npm ERR! Fix the upstream dependency conflict, or retry
npm ERR! this command with --force or --legacy-peer-deps
npm ERR! to accept an incorrect (and potentially broken) dependency resolution.

[simonihmig]

LGTM, thank you!

CI (when someone with the right permissions will enable it here) will still fail probably, as this repo is not setup for Ember 5 yet. We need to add @ember/string as a devDependency I think, or just run ember-cli-update here...

[kategengler]

Thank you! Merging with failing scenarios that will be fixed by #411