Remove initTimeagoTimeout and let timeago.js update timeagos internally.

MR: !12468

app/assets/javascripts/lib/utils/datetime_utility.js

@@ -112,29 +112,11 @@ window.dateFormat = dateFormat;
       return timefor;
     };
 
-    w.gl.utils.cachedTimeagoElements = [];
     w.gl.utils.renderTimeago = function($els) {
-      if (!$els && !w.gl.utils.cachedTimeagoElements.length) {
-        w.gl.utils.cachedTimeagoElements = [].slice.call(document.querySelectorAll('.js-timeago-render'));
-      } else if ($els) {
-        w.gl.utils.cachedTimeagoElements = w.gl.utils.cachedTimeagoElements.concat($els.toArray());
-      }
-
-      w.gl.utils.cachedTimeagoElements.forEach(gl.utils.updateTimeagoText);
-    };
-
-    w.gl.utils.updateTimeagoText = function(el) {
-      const formattedDate = gl.utils.getTimeago().format(el.getAttribute('datetime'), lang);
-
-      if (el.textContent !== formattedDate) {
-        el.textContent = formattedDate;
-      }
-    };
-
-    w.gl.utils.initTimeagoTimeout = function() {
-      gl.utils.renderTimeago();
+      const timeagoEls = $els || document.querySelectorAll('.js-timeago-render');
 
-      gl.utils.timeagoTimeout = setTimeout(gl.utils.initTimeagoTimeout, 1000);
+      // timeago.js sets timeouts internally for each timeago value to be updated in real time
+      gl.utils.getTimeago().render(timeagoEls);
     };
 
     w.gl.utils.getDayDifference = function(a, b) {

app/assets/javascripts/main.js

@@ -358,7 +358,7 @@ $(function () {
   gl.awardsHandler = new AwardsHandler();
   new Aside();
 
-  gl.utils.initTimeagoTimeout();
+  gl.utils.renderTimeago();
 
   $(document).trigger('init.scrolling-tabs');
 });