ci: adds no deprecations workflow

[matthewhartstonge]

TSIA!

Removes deprecations from the dummy app where it was directly accessing the application controller router:

• https://deprecations.emberjs.com/id/application-controller-router-properties

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[github-actions[bot]]

Some tests with 'continue-on-error: true' have failed:

• ember-canary

  • embroider-optimized
  • ember-beta
  • embroider-safe
  • no-deprecations

  Created by continue-on-error-comment

[github-actions[bot]]

Some tests with 'continue-on-error: true' have failed:

• ember-release

  Created by continue-on-error-comment

[github-actions[bot]]

Some tests with 'continue-on-error: true' have failed:

• ember-release-no-deprecations

  Created by continue-on-error-comment