Update ember-cli to v4.4 and drop support for node v12

[fsmanuel]

• Updates ember-cli to v4.4
• Updates ember-data to v4.4
• Updates and drops dependencies
• Replaces ember-font-awesome with @fortawesome/ember-fontawesome

There will be a follow up PR with the update to ember-cli v4.8 as that is more involved and needs changes for ember-data to work.

Release, Beta, and Canary are expected to fail. Current test coverage is 3.28 -> 4.4

https://github.com/adopted-ember-addons/ember-cp-validations/issues/716

[knownasilya]

Could you add ember 4.4 to ember-try/actions configs?

[fsmanuel]

@knownasilya We don't need to add 4.4 as it's the default (in package.json) and tested via the normal tests. It seems ember-cli-update takes good care of that and the next update to ember-cli v4.8 will add the ember-lts-4.4 scenario.

[fsmanuel]

@knownasilya Thanks for the review!