DEV: reduces memory footprint of tests - step 1 (#7591)

app/assets/javascripts/admin/controllers/admin-web-hooks-show-events.js.es6

@@ -4,9 +4,14 @@ import computed from "ember-addons/ember-computed-decorators";
 
 export default Ember.Controller.extend({
   pingDisabled: false,
-  incomingEventIds: [],
   incomingCount: Ember.computed.alias("incomingEventIds.length"),
 
+  init() {
+    this._super(...arguments);
+
+    this.incomingEventIds = [];
+  },
+
   @computed("incomingCount")
   hasIncoming(incomingCount) {
     return incomingCount > 0;