chore(TravisCI): Remove testing jobs
chore(TravisCI): Remove testing jobs

We have GitHub Actions for the CI tests now. We still need TravisCI for releases though until we can migrate that to GitHub Actions too.

mike-north/ember-api-actions,mike-north/ember-api-actions,mike-north/ember-api-actions,truenorth/ember-api-actions,mike-north/ember-api-actions,truenorth/ember-api-actions