reduce heavy references

app/assets/javascripts/vue_pipelines_index/pipelines.js.es6

@@ -83,8 +83,8 @@
         };
         return commitRef;
       },
-      addTimeInterval(id, that) {
-        this.allTimeIntervals.push({ id, component: that });
+      addTimeInterval(id, start) {
+        this.allTimeIntervals.push({ id, start });
       },
     },
     template: `

app/assets/javascripts/vue_pipelines_index/store.js.es6

@@ -48,7 +48,7 @@
       };
 
       const startIntervalLoops = () => {
-        this.allTimeIntervals.forEach(e => e.component.startInterval());
+        this.allTimeIntervals.forEach(e => e.start());
       };
 
       window.onbeforeunload = function onClose() {

app/assets/javascripts/vue_pipelines_index/time_ago.js.es6

@@ -17,7 +17,7 @@
         this.currentTime = new Date();
       }, 1000);
 
-      this.addTimeInterval(this.timeInterval, this);
+      this.addTimeInterval(this.timeInterval, this.startInterval);
     },
     computed: {
       localTimeFinished() {