Separate system operations from core objects in GraphQL endpoints (#12977)

Moves system-level operations (auth, billing, admin) to use the
/metadata endpoint instead of /graphql.

This cleans up the endpoint separation so /graphql is purely for core
objects (Company, People, etc.) and /metadata handles all system
operations.

Part of prep work for webhook/API key core migration.

packages/twenty-front/src/modules/auth/services/AuthService.ts

@@ -7,14 +7,14 @@ import {
 } from '@apollo/client';
 
 import { loggerLink } from '@/apollo/utils/loggerLink';
+import { isDefined } from 'twenty-shared/utils';
 import {
   AuthTokenPair,
   RenewTokenDocument,
   RenewTokenMutation,
   RenewTokenMutationVariables,
-} from '~/generated/graphql';
+} from '~/generated-metadata/graphql';
 import { isUndefinedOrNull } from '~/utils/isUndefinedOrNull';
-import { isDefined } from 'twenty-shared/utils';
 
 const logger = loggerLink(() => 'Twenty-Refresh');