Feat: Fixed the issue where the prompt menu content was hidden #3221 (#8530)

### What problem does this PR solve?

Feat: Fixed the issue where the prompt menu content was hidden #3221

### Type of change


- [x] New Feature (non-breaking change which adds functionality)

web/src/pages/agent/form/components/prompt-editor/variable-picker-plugin.tsx

@@ -67,7 +67,6 @@ function VariablePickerMenuItem({
     option: VariableOption | VariableInnerOption,
   ) => void;
 }) {
-  console.info('xxxx');
   return (
     <li
       key={option.key}
@@ -245,11 +244,10 @@ export default function VariablePickerMenuPlugin({
       options={buildNextOptions()}
       menuRenderFn={(anchorElementRef, { selectOptionAndCleanUp }) => {
         const nextOptions = buildNextOptions();
-        console.log('🚀 ~ nextOptions:', nextOptions);
         return anchorElementRef.current && nextOptions.length
           ? ReactDOM.createPortal(
               <div className="typeahead-popover w-[200px] p-2">
-                <ul>
+                <ul className="overflow-y-auto !scrollbar-thin overflow-x-hidden">
                   {nextOptions.map((option, i: number) => (
                     <VariablePickerMenuItem
                       index={i}