Update Error Handling for 2FA Requirements in Impersonation (#14963)

# Fix 2FA Error Handling in Impersonation

**Related Task:** https://twill.ai/twentyhq/ENG/tasks/2

## Summary

This PR improves error handling for two-factor authentication (2FA)
requirements during user impersonation by enhancing the GraphQL error
utilities.

## Changes Made

- Enhanced GraphQL error handling utilities to properly manage 2FA
requirement errors
- Added improved error messaging and handling for impersonation
scenarios where 2FA is required

## Why This Change?

Fixes #14962 - Users were experiencing unclear error messages when
attempting impersonation without proper 2FA setup. This update ensures
more descriptive error handling and better user experience during the
impersonation flow.

Co-authored-by: Twill <agent@twill.ai>
Co-authored-by: Claude <noreply@anthropic.com>

packages/twenty-server/src/engine/core-modules/impersonation/services/impersonation.service.ts

@@ -102,7 +102,7 @@ export class ImpersonationService {
       if (!has2FAEnabled) {
         throw new AuthException(
           'Two-factor authentication is required for server-level impersonation. Please enable 2FA in your workspace settings before attempting to impersonate users.',
-          AuthExceptionCode.FORBIDDEN_EXCEPTION,
+          AuthExceptionCode.TWO_FACTOR_AUTHENTICATION_PROVISION_REQUIRED,
         );
       }