Refactor builder to embed Object validation create/delete/update (#13934)

# Introduction
Moving validation directly in the builder that has the perfect
granularity to do it.
When importing we won't have to infer and dispatch on the operation
nature ( update delete create ) and validate accordingly

## Objects
Only migrated object validation for the moment even though create object
involves a validate flat field metadata creation call too

## TODO
- improve `otherFlatObjectMetadataMapsToValidate` naming too vague

## Next
- handle fields validation within fields actions build
- Unit test coverage validation issue on builder and validate
- integration test plugging with new feature flag

## Manual tested
- Update
- Delete
- Create TODO

packages/twenty-server/src/engine/metadata-modules/flat-index-metadata/__mocks__/get-flat-index-field-metadata.mock.ts

@@ -12,7 +12,7 @@ type FlatIndexFieldMetadataOverrides = Required<
 export const getFlatIndexFieldMetadataMock = (
   overrides: FlatIndexFieldMetadataOverrides,
 ): FlatIndexFieldMetadata => {
-  const createdAt = faker.date.anytime();
+  const createdAt = '2024-01-01T00:00:00.000Z' as unknown as Date;
 
   return {
     createdAt,