UI: upgrade Ember to 5.4 (#26708)

ui/lib/kubernetes/addon/components/page/overview.hbs

@@ -26,6 +26,7 @@
       <div class="has-top-margin-m is-flex">
         <SearchSelect
           class="is-flex-grow-1"
+          @ariaLabel="Role"
           @placeholder="Type to find a role..."
           @disallowNewItems={{true}}
           @options={{this.roleOptions}}

ui/lib/kubernetes/index.js

@@ -14,6 +14,9 @@ module.exports = buildEngine({
   lazyLoading: {
     enabled: false,
   },
+  babel: {
+    plugins: [require.resolve('ember-concurrency/async-arrow-task-transform')],
+  },
   isDevelopingAddon() {
     return true;
   },