CSV importing and exporting fixes (#8824)

Fixes issue https://github.com/twentyhq/twenty/issues/5793 (and
duplicate https://github.com/twentyhq/twenty/issues/8822)

- Fix importing multi-select and array fields.
- Fix exporting and importing RAW_JSON fields.

---------

Co-authored-by: ad-elias <elias@autodiligence.com>

packages/twenty-front/src/modules/spreadsheet-import/steps/components/MatchColumnsStep/MatchColumnsStep.tsx

@@ -77,7 +77,7 @@ export enum ColumnType {
 
 export type MatchedOptions<T> = {
   entry: string;
-  value: T;
+  value?: T;
 };
 
 type EmptyColumn = { type: ColumnType.empty; index: number; header: string };