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/workspace-manager/workspace-migration.exception.ts

@@ -0,0 +1,8 @@
+import { CustomException } from 'src/utils/custom-exception';
+
+export class WorkspaceMigrationV2Exception extends CustomException<WorkspaceMigrationV2ExceptionCode> {}
+
+export enum WorkspaceMigrationV2ExceptionCode {
+  BUILDER_INTERNAL_SERVER_ERROR = 'BUILDER_INTERNAL_SERVER_ERROR',
+  RUNNER_INTERNAL_SERVER_ERROR = 'RUNNER_INTERNAL_SERVER_ERROR',
+}