Identification cleanup (#17301)

# Introduction

following https://github.com/twentyhq/twenty/pull/17279
As we've finally identified all the syncable metadata entities, which
means they're expected to have non nullable applicationId and
universalIdentifier at pg_level we can remove previous retro comp
universalIdentifier fallbacking and update the dto too

~~This needs IdentifyRemainingEntitiesMetadataCommand and
MakeRemainingEntitiesUniversalIdentifierAndApplicationIdNotNullableMigrationCommand
to be run~~
```ts
[Nest] 197  - 01/21/2026, 3:08:35 PM     LOG [MakeRemainingEntitiesUniversalIdentifierAndApplicationIdNotNullableMigrationCommand] Successfully run MakeRemainingEntitiesUniversalIdentifierAndApplicationIdNotNullableMigrationCommand
```

packages/twenty-server/src/engine/metadata-modules/role/role.resolver.ts

@@ -313,7 +313,7 @@ export class RoleResolver {
         createdAt: agentEntity.createdAt.toISOString(),
         updatedAt: agentEntity.updatedAt.toISOString(),
         deletedAt: agentEntity.deletedAt?.toISOString() ?? null,
-        universalIdentifier: agentEntity.universalIdentifier ?? agentEntity.id,
+        universalIdentifier: agentEntity.universalIdentifier,
         roleId: role.id,
       }),
     );

packages/twenty-server/src/engine/metadata-modules/role/utils/fromFlatRoleToRoleDto.util.ts

@@ -35,6 +35,6 @@ export const fromFlatRoleToRoleDto = ({
     description: description ?? undefined,
     icon: icon ?? undefined,
     standardId: standardId ?? undefined,
-    universalIdentifier: universalIdentifier ?? undefined,
+    universalIdentifier,
   };
 };