Added a clear/reset button in InternalDateInput to reset/unschedule events (#3154)

* Added a clear/reset button in InternalDateInput to reset/unschedule events

* Added clearable prop to <InternalDateInput /> and fixed some design mistakes

* Removed unnecessary code that was used during debugging

* Replaced button with <MenuItem /> component

* Fixed null date in ObjectFilterDropdownDateSearchInput

* Moved clear context call from DateInput to DateFieldInput

* Removed useless props

---------

Co-authored-by: Lucas Bordeau <bordeau.lucas@gmail.com>

packages/twenty-front/src/modules/activities/components/ActivityEditor.tsx

@@ -90,6 +90,7 @@ export const ActivityEditor = ({
     objectRecordId: activity.id,
     fieldMetadataName: 'dueAt',
     fieldPosition: 0,
+    clearable: true,
   });
 
   const { FieldContextProvider: AssigneeFieldContextProvider } =
@@ -98,6 +99,7 @@ export const ActivityEditor = ({
       objectRecordId: activity.id,
       fieldMetadataName: 'assignee',
       fieldPosition: 1,
+      clearable: true,
     });
 
   const updateTitle = useCallback(