main ← test-fixes
merged 12:01PM - 30 Nov 21 UTC
* Running the tests only in the ember cli env hid the fact that the pending post…s feature wasn't working in the legacy environment
* Tests were using ember-cli-only APIs while there are widely used testing APIs in Discourse that support both ember envs
* `ember-test-selectors` was in both dependencies and devDependencies in discourse/package.json
* `qunit-dom` in package.json was not only unused but also defunct, as it wasn't pulled into the legacy env app
A followup to #14501, and #15128.