Fix tests

[marcoow]

This fixes CI by:

• running ember init on all packages so that the project files are up to date with the latest blueprints in ember-cli and use the latest dependencies for the ember and ember-cli versions we're using
• allowing the tests for the release version of ember for the test app and classic test app to fail since we're running into [Bug] Some addons fail ember:try scenarios with ember-release (3.25) with loc$$1.sliceStartChars is not a function emberjs/ember.js#19432 (which should be fixed by dropping ember-bootstrap – see Drop ember-bootstrap dependency from classic test app #2292, Drop ember bootstrap from modern test app #2293)
• fixing some tests for deprecations that were breaking since they didn't take into account that additional deprecations could be introduced by other packages, e.g. Ember itself

[sdebarros]

Is this not needed anymore?

[marcoow]

This is what ember init generates but it seems fine since the testem docs say:

framework - the test framework that you are using, in the browser, in the case that you are not also using the test_page option.