Add ember-cli-sass addon to default blueprint.
Add ember-cli-sass addon to default blueprint.

Versions of @glimmer/application-pipeline after 0.7.0 will issue a
deprecation warning when SASS files are present but ember-cli-sass
is not.

This squelches the deprecation warning.

glimmerjs/glimmer.js,glimmerjs/glimmer.js,glimmerjs/glimmer.js,glimmerjs/glimmer.js