Standardize on the "render" action for tracking banner displayment

app/assets/javascripts/security_configuration/components/upgrade_banner.vue

@@ -28,7 +28,7 @@ export default {
     buttonText: s__('SecurityConfiguration|Upgrade or start a free trial'),
   },
   mounted() {
-    this.track('display_banner', { label: SECURITY_UPGRADE_BANNER });
+    this.track('render', { label: SECURITY_UPGRADE_BANNER });
   },
   methods: {
     bannerClosed() {

spec/frontend/security_configuration/components/upgrade_banner_spec.js

@@ -54,7 +54,7 @@ describe('UpgradeBanner component', () => {
 
       createComponent();
 
-      expectTracking('display_banner', SECURITY_UPGRADE_BANNER);
+      expectTracking('render', SECURITY_UPGRADE_BANNER);
     });
   });