Remove template-only component setting

The ClientDetail.attributesTable assertion was failing because
it becoming a template-only component meant that the
data-test-attributes selector had no element to attach to.

Having the edition set to Octane in package.json causes an error
to be thrown when template-only-glimmer-components is turned
off, so it’ll have to go for now.

ui/config/optional-features.json

@@ -2,5 +2,5 @@
   "application-template-wrapper": false,
   "default-async-observers": true,
   "jquery-integration": false,
-  "template-only-glimmer-components": true
+  "template-only-glimmer-components": false
 }

ui/package.json

@@ -136,9 +136,6 @@
   "engines": {
     "node": "10.* || >= 12"
   },
-  "ember": {
-    "edition": "octane"
-  },
   "private": true,
   "ember-addon": {
     "paths": [