Fix filter multi select (#8682)

- Created a dropdown inside a dropdown for the
`ObjectFilterDropdownOperandDropdown` so the operand can be opened over
the selection with an offset
- Refactored dropdown component and introduced `DropdownUnmountEffect`
to close the dropdown when the component unmounts
- Removed old logic

Before:
<img width="216" alt="Capture d’écran 2024-11-22 à 14 03 58"
src="https://github.com/user-attachments/assets/3c1bba03-af03-4993-a070-f009b8dc876f">

After:
<img width="222" alt="Capture d’écran 2024-11-22 à 14 03 40"
src="https://github.com/user-attachments/assets/a8a784b4-8672-4b02-bb21-e4a749682f2e">

packages/twenty-front/src/modules/action-menu/components/RightDrawerActionMenuDropdown.tsx

@@ -62,7 +62,7 @@ export const RightDrawerActionMenuDropdown = () => {
       clickableComponent={<Button title="Actions" shortcut="⌘O" />}
       dropdownPlacement="top-end"
       dropdownOffset={{
-        y: parseInt(theme.spacing(2)),
+        y: parseInt(theme.spacing(2), 10),
       }}
       dropdownComponents={
         <DropdownMenuItemsContainer>