Icu 16546 upgrade ember for admin UI (#2793)

* v4.12.2...v5.12.0

* chore: 🤖 yarn.lock changes

* chore: 🤖 ember init blueprint changes

* chore: 🤖 yarn.lock file changes

* style: 💄 run linter and formatter

✅ Closes: https://hashicorp.atlassian.net/browse/ICU-16546

ui/admin/.ember-cli

@@ -1,12 +1,4 @@
 {
-  /**
-    Ember CLI sends analytics information by default. The data is completely
-    anonymous, but there are times when you might want to disable this behavior.
-
-    Setting `disableAnalytics` to true will prevent any data from being sent.
-  */
-  "disableAnalytics": false,
-
   /**
     Setting `isTypeScriptProject` to true will force the blueprint generators to generate TypeScript
     rather than JavaScript by default, when a TypeScript version of a given blueprint is available.