Import - Upsert on composite fields (#12615)

To test : 
- Import a record with Id column (for upsert-ing) + some subfields in
each composite fields. Check that only matched subfields are updated
(Main issue)
- Import a record with a multi-select field - Check it works + Match
multi-select field on a non multi-select column, check it does not work.
(Specific bug fixed in second commit is : undefined value in multi
select column (corresponding to no item selected) caused error in
multi-select parsing).

closes https://github.com/twentyhq/core-team-issues/issues/990

packages/twenty-front/src/modules/spreadsheet-import/utils/setColumn.ts

@@ -5,6 +5,7 @@ import { SpreadsheetColumn } from '@/spreadsheet-import/types/SpreadsheetColumn'
 import { SpreadsheetColumnType } from '@/spreadsheet-import/types/SpreadsheetColumnType';
 import { SpreadsheetMatchedOptions } from '@/spreadsheet-import/types/SpreadsheetMatchedOptions';
 import { t } from '@lingui/core/macro';
+import { isDefined } from 'twenty-shared/utils';
 import { z } from 'zod';
 import { uniqueEntries } from './uniqueEntries';
 
@@ -53,6 +54,7 @@ export const setColumn = <T extends string>(
           data
             ?.flatMap((row) => {
               const value = row[oldColumn.index];
+              if (!isDefined(value)) return [];
               const options = JSON.parse(z.string().parse(value));
               return z.array(z.string()).parse(options);
             })