Fix "No results found" in record pickers (#12685)

This PR fixes small bugs around the "No results found" record picker.

Before : 


https://github.com/user-attachments/assets/e2eee648-1cb1-40fb-ad3c-fe4724f7314e

After : 


https://github.com/user-attachments/assets/714e6dea-3c65-4e04-9fef-ee718c94bbba

Minor improvements : 
- Created a new component `RecordPickerNoRecordFoundMenuItem` to
abstract this "No records found" menu item
- Removed `not-allowed` cursor from MenuItem in disabled state.

Fixes https://github.com/twentyhq/twenty/issues/12666

packages/twenty-ui/src/navigation/menu-item/components/MenuItemDraggable.tsx

@@ -36,7 +36,7 @@ export const MenuItemDraggable = ({
 
   const cursorType = showGrip
     ? isDragDisabled
-      ? 'not-allowed'
+      ? 'default'
       : 'drag'
     : 'default';
 

packages/twenty-ui/src/navigation/menu-item/internals/components/StyledMenuItemBase.tsx

@@ -131,7 +131,7 @@ export const StyledDraggableItem = styled.div`
 export const StyledHoverableMenuItemBase = styled(StyledMenuItemBase)<{
   disabled?: boolean;
   isIconDisplayedOnHoverOnly?: boolean;
-  cursor?: 'drag' | 'default' | 'not-allowed';
+  cursor?: 'drag' | 'default';
 }>`
   ${({ isIconDisplayedOnHoverOnly, theme }) =>
     isIconDisplayedOnHoverOnly &&
@@ -156,14 +156,12 @@ export const StyledHoverableMenuItemBase = styled(StyledMenuItemBase)<{
 
   cursor: ${({ cursor, disabled }) => {
     if (!isUndefined(disabled) && disabled !== false) {
-      return 'not-allowed';
+      return 'default';
     }
 
     switch (cursor) {
       case 'drag':
         return 'grab';
-      case 'not-allowed':
-        return 'not-allowed';
       default:
         return 'pointer';
     }