Update job row to no longer watch job-summary or reload the job

Now that job summary is pushed into the store from the list request
and the task group count is derived from the summary, the detailed
job information is no longer needed for a job row.

ui/app/components/job-row.js

@@ -1,10 +1,8 @@
 import { inject as service } from '@ember/service';
 import Component from '@ember/component';
 import { lazyClick } from '../helpers/lazy-click';
-import { watchRelationship } from 'nomad-ui/utils/properties/watch';
-import WithVisibilityDetection from 'nomad-ui/mixins/with-component-visibility-detection';
 
-export default Component.extend(WithVisibilityDetection, {
+export default Component.extend({
   store: service(),
 
   tagName: 'tr',
@@ -17,32 +15,4 @@ export default Component.extend(WithVisibilityDetection, {
   click(event) {
     lazyClick([this.get('onClick'), event]);
   },
-
-  didReceiveAttrs() {
-    // Reload the job in order to get detail information
-    const job = this.get('job');
-    if (job && !job.get('isLoading')) {
-      job.reload().then(() => {
-        this.get('watch').perform(job, 100);
-      });
-    }
-  },
-
-  visibilityHandler() {
-    if (document.hidden) {
-      this.get('watch').cancelAll();
-    } else {
-      const job = this.get('job');
-      if (job && !job.get('isLoading')) {
-        this.get('watch').perform(job, 100);
-      }
-    }
-  },
-
-  willDestroy() {
-    this.get('watch').cancelAll();
-    this._super(...arguments);
-  },
-
-  watch: watchRelationship('summary'),
 });

ui/app/templates/components/job-row.hbs

@@ -5,8 +5,8 @@
 <td data-test-job-type>{{job.displayType}}</td>
 <td data-test-job-priority>{{job.priority}}</td>
 <td data-test-job-task-groups>
-  {{#if job.taskGroups.length}}
-    {{job.taskGroups.length}}
+  {{#if job.taskGroupCount}}
+    {{job.taskGroupCount}}
   {{else}}
     --
   {{/if}}