[FIX] web_tour: clear _transitionEndTimer before destory the tip widget

Before this commit, when we doing the tour. If we move the mouse fast
enough. We may trigger the tip_consumed event before its
_transitionEndTimer call its callback to update the position, and a
bubble will be left there.

In this commit, we clear the _transitionEndTimer timeout before we
destory the widget to prevent the issue.

Task 2298950
PR #55155

addons/web_tour/static/src/js/tip.js

@@ -107,6 +107,9 @@ var Tip = Widget.extend({
         this._unbind_anchor_events();
         clearTimeout(this.timerIn);
         clearTimeout(this.timerOut);
+        // clear this timeout so that we won't call _updatePosition after we
+        // destroy the widget and leave an undesired bubble.
+        clearTimeout(this._transitionEndTimer);
 
         // Do not remove the parent class if it contains other tooltips
         const _removeParentClass = $el => {