Refactor default value for select (#5343)

In this PR, we are refactoring two things:
- leverage field.defaultValue for Select and MultiSelect settings form
(instead of option.isDefault)
- use quoted string (ex: "'USD'") for string default values to embrace
backend format

---------

Co-authored-by: Thaïs Guigon <guigon.thais@gmail.com>

packages/twenty-front/src/modules/object-record/record-field/validation-schemas/currencyCodeSchema.ts

@@ -0,0 +1,5 @@
+import { z } from 'zod';
+
+import { CurrencyCode } from '@/object-record/record-field/types/CurrencyCode';
+
+export const currencyCodeSchema = z.nativeEnum(CurrencyCode);