FIX: add the required widget for admin-problems notification item (#22602)

app/assets/javascripts/discourse/app/widgets/admin-problems-notification-item.js

@@ -0,0 +1,19 @@
+import { DefaultNotificationItem } from "discourse/widgets/default-notification-item";
+import I18n from "I18n";
+import { createWidgetFrom } from "discourse/widgets/widget";
+import getURL from "discourse-common/lib/get-url";
+import { iconNode } from "discourse-common/lib/icon-library";
+
+createWidgetFrom(DefaultNotificationItem, "admin-problems-notification-item", {
+  text() {
+    return I18n.t("notifications.admin_problems");
+  },
+
+  url() {
+    return getURL("/admin");
+  },
+
+  icon() {
+    return iconNode("gift");
+  },
+});