Fixed context menu on index page (#9316)

Fixes https://github.com/twentyhq/twenty/issues/8970

The context menu wasn't working because of wrong architecture with the
Dropdown component, as it's a unique behavior (no clickable component
and portal) it also required refactoring a bit the Dropdown component.

- Context menu now uses a portal
- Fixed dropdown offset without clickable component (now using a
fallback anchor component)
- Fixed React array key props

packages/twenty-front/src/modules/ui/field/display/components/ArrayDisplay.tsx

@@ -10,8 +10,12 @@ type ArrayDisplayProps = {
 export const ArrayDisplay = ({ value }: ArrayDisplayProps) => {
   return (
     <ExpandableList>
-      {value?.map((item) => (
-        <Chip variant={ChipVariant.Highlighted} label={item} />
+      {value?.map((item, index) => (
+        <Chip
+          key={`${item}-${index}`}
+          variant={ChipVariant.Highlighted}
+          label={item}
+        />
       ))}
     </ExpandableList>
   );