Fix CI for latest Ember v4 beta/canary scenarios

[SergeAstapov]

This makes CI happy/green via:

• updated .github/workflows/ci.yml to use the latest addon blueprint
• Disabled ember-keyboard-first-responder-inputs initializer to avoid using removed built-in components
• Upgrades couple of devDependencies to make CI pass: ember-auto-import@2 and ember-test-selectors
• Updates tests/dummy/config/targets.js otherwise build fails with error originating in ember-auto-import/webpack due to invalid maintained node versions entry in targets.js
• Updates some ember try scenarios to make CI happy for both ember 3.8 and 4.0-beta/4.1-canary at the same time

[lukemelia]

Thanks @SergeAstapov!