Factor out popup menu component.

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

app/javascript/src/javascripts/user_tooltips.js

@@ -25,19 +25,6 @@ UserTooltip.initialize = function () {
     onShow: UserTooltip.on_show,
     onHide: UserTooltip.on_hide,
   });
-
-  delegate("#user-tooltips", {
-    allowHTML: true,
-    interactive: true,
-    theme: "common-tooltip",
-    target: ".user-tooltip-menu-button",
-    placement: "bottom",
-    touch: false,
-    trigger: "click",
-    content: (element) => {
-      return $(element).parents(".user-tooltip").find(".user-tooltip-menu").get(0);
-    }
-  });
 };
 
 UserTooltip.on_show = async function (instance) {