Refactor edition enablement (#1657)

* refactor: 💡 consolidate ssh features into ssh-target flag

✅ Closes: ICU-8383

* refactor: 💡 factor out base edition

* feat: 🎸 dynamic feature edition enablement and toggling

ui/admin/app/instance-initializers/feature-edition.js

@@ -0,0 +1,8 @@
+export function initialize(owner) {
+  const service = owner.lookup('service:feature-edition');
+  service.initialize();
+}
+
+export default {
+  initialize,
+};