Convert nested-addon-smoke-test to use DistChecker for Embroider
Convert nested-addon-smoke-test to use DistChecker for Embroider

DistChecker allows us to test against classic and Embroider builds for
tests that explicitly check for file assets in dist (Embroider does
not make any guaranties about file names in dist)

ember-cli/ember-cli,buschtoens/ember-cli,elwayman02/ember-cli,raycohen/ember-cli,thoov/ember-cli,kategengler/ember-cli,thoov/ember-cli,thoov/ember-cli,asakusuma/ember-cli,jrjohnson/ember-cli,buschtoens/ember-cli,kategengler/ember-cli,elwayman02/ember-cli,asakusuma/ember-cli,balinterdi/ember-cli,balinterdi/ember-cli,ember-cli/ember-cli,thoov/ember-cli,jrjohnson/ember-cli,ember-cli/ember-cli,raycohen/ember-cli