refactor: Remove EmberArray use in /target/hosts to simplify

ui/desktop/app/routes/scopes/scope/projects/targets/target/hosts.js

@@ -1,6 +1,5 @@
 import Route from '@ember/routing/route';
 import { all } from 'rsvp';
-import { A } from '@ember/array';
 
 export default class ScopesScopeProjectsTargetsTargetHostsRoute extends Route {
   // =methods
@@ -11,25 +10,26 @@ export default class ScopesScopeProjectsTargetsTargetHostsRoute extends Route {
    */
   async model() {
     const { host_sets } = this.modelFor('scopes.scope.projects.targets.target');
-    const hostSetsPromises = await all(
+    // Load all host-sets
+    const hostSets = await all(
       host_sets.map(({ host_set_id }) => 
         this.store.findRecord('host-set', host_set_id)
       )
     );
 
-    // Extract host ids from all host set
-    const hostIds = A();
-    hostSetsPromises.map(({ host_ids }) => 
-      host_ids.forEach(({ value }) => hostIds.push(value) )
-    );
-    
-    // Fetch all hosts
-    const hostPromises = await all(
-      hostIds.uniq().map((hostId) => 
-        this.store.findRecord('host', hostId)
-      )
+    // Extract host ids from all host sets
+    const hostIds = hostSets.map(({host_ids}) =>
+      host_ids.content.map((hostId) =>
+        hostId.value
+      ) 
     )
 
-    return all(hostPromises);
+    // Load unique hosts
+    const uniqueHostIds = new Set(hostIds.flat());
+    return all(
+      [...uniqueHostIds].map((hostId) => 
+        this.store.findRecord('host', hostId)
+      )
+    );
   }
 }