Connect - Update Gql schema generation (#13001)

To test : 

```
mutation testMutation {
  createPerson(
    data: {company: {connect: {where: {domainName: {primaryLinkUrl: "airbnb.com"}}}}}
  ) {
    id
  }
}
```

closes https://github.com/twentyhq/core-team-issues/issues/1167

packages/twenty-server/src/engine/core-modules/feature-flag/enums/feature-flag-key.enum.ts

@@ -7,4 +7,5 @@ export enum FeatureFlagKey {
   IS_AI_ENABLED = 'IS_AI_ENABLED',
   IS_IMAP_ENABLED = 'IS_IMAP_ENABLED',
   IS_WORKFLOW_FILTERING_ENABLED = 'IS_WORKFLOW_FILTERING_ENABLED',
+  IS_RELATION_CONNECT_ENABLED = 'IS_RELATION_CONNECT_ENABLED',
 }