It's important to keep our core log output as clean as possible to avoid 'crying wolf', and so that any deprecations triggered by plugin/theme tests are indeed caused by that theme/plugin, and not core.
This commit will make the core test suite fail if any deprecations are triggered. If a new deprecation is introduced (e.g. as part of a dependency update) and we need more time to resolve it it can be silenced via ember-deprecation-workflow.
This does not affect plugin/theme test runs.
David Taylor
8f1a5c9392