Factor out popup menu component.

Factor out the popup menu inside user tooltips into a reusable
component.

app/components/popup_menu_component/popup_menu_component.js

@@ -0,0 +1,26 @@
+import { delegate } from 'tippy.js';
+import 'tippy.js/dist/tippy.css';
+
+class PopupMenuComponent {
+  static initialize() {
+    delegate("body", {
+      allowHTML: true,
+      interactive: true,
+      theme: "common-tooltip",
+      target: "a.popup-menu-button",
+      placement: "bottom-start",
+      trigger: "click",
+      content: PopupMenuComponent.content,
+    });
+  }
+
+  static content(element) {
+    let $content = $(element).parents(".popup-menu").find(".popup-menu-content");
+    $content.show();
+    return $content.get(0);
+  }
+}
+
+$(document).ready(PopupMenuComponent.initialize);
+
+export default PopupMenuComponent;