[FIX] website: fix website text edition test

Since [1] the `website_text_edition` tour fails because it manages to
change tab, drop a block, select a paragraph and click on a button
before the bundle reload happens.

This commit makes sure `updateOptionsUI` is awaited and that any
subsequent call is only queued afterwards.

task-3370939

[1]: https://github.com/odoo/odoo/commit/c511e100cad2febc0ebb9ce61b5eb52232e60f7d

closes odoo/odoo#129855

X-original-commit: 81abdb96aeb95e492230d39000e28c0d239840de
Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>
Signed-off-by: Benoit Socias (bso) <bso@odoo.com>

addons/website/static/src/js/editor/snippets.editor.js

@@ -462,18 +462,20 @@ const wSnippetMenu = weSnippetEditor.SnippetsMenu.extend({
      * @private
      */
     _onReloadBundles(ev) {
-        this._mutex.exec(() => {
-            const excludeSelector = this.optionsTabStructure.map(element => element[0]).join(', ');
-            for (const editor of this.snippetEditors) {
-                if (!editor.$target[0].matches(excludeSelector)) {
-                    if (this._currentTab === this.tabs.THEME) {
+        const excludeSelector = this.optionsTabStructure.map(element => element[0]).join(', ');
+        for (const editor of this.snippetEditors) {
+            if (!editor.$target[0].matches(excludeSelector)) {
+                if (this._currentTab === this.tabs.THEME) {
+                    this._mutex.exec(() => {
                         editor.destroy();
-                    } else {
-                        editor.updateOptionsUI(true);
-                    }
+                    });
+                } else {
+                    this._mutex.exec(async () => {
+                        await editor.updateOptionsUI(true);
+                    });
                 }
             }
-        });
+        }
     },
 });