refact: preserve promise.then behavior for acceptance tests

ui/app/routes/allocations/allocation.js

@@ -36,18 +36,18 @@ export default class AllocationRoute extends Route.extend(WithWatchers) {
     }
   }
 
-  async model() {
-    try {
-      // Preload the job for the allocation since it's required for the breadcrumb trail
-      const allocation = await super.model(...arguments);
-      const jobId = allocation?.belongsTo('job').id();
-      const getJob = this.store.findRecord('job', jobId);
-      const getNamespaces = this.store.findAll('namespace');
-      await Promise.all([getJob, getNamespaces]);
-      return allocation;
-    } catch {
-      notifyError(this);
-    }
+  model() {
+    // Preload the job for the allocation since it's required for the breadcrumb trail
+    return super
+      .model(...arguments)
+      .then((allocation) => {
+        const jobId = allocation.belongsTo('job').id();
+        return this.store
+          .findRecord('job', jobId)
+          .then(() => this.store.findAll('namespace')) // namespaces belong to a job and are an asynchronous relationship so we can peak them later on
+          .then(() => allocation);
+      })
+      .catch(notifyError(this));
   }
 
   @watchRecord('allocation') watch;