Fix upsert in ORM (#13589)

Before:
<img width="1496" height="850" alt="image"
src="https://github.com/user-attachments/assets/bb334c4d-99c3-4237-90e3-02400ab566f5"
/>

After: 
<img width="1496" height="850" alt="image"
src="https://github.com/user-attachments/assets/4e53bdf0-6f2c-4a11-9836-d83f44291a0b"
/>


Query:
```
mutation CreatePerson($upsert: Boolean, $data: PersonCreateInput) {
  createPerson(upsert: $upsert, data: $data) {
    jobTitle
    id
  }
}
```

Variables:
```
{
  "upsert": true,
  "data": {
    "name": { "firstName": "marie"}
  }
}
```

packages/twenty-server/src/engine/twenty-orm/entity-manager/workspace-entity-manager.ts

@@ -190,8 +190,8 @@ export class WorkspaceEntityManager extends EntityManager {
   override upsert<Entity extends ObjectLiteral>(
     target: EntityTarget<Entity>,
     entityOrEntities:
-      | QueryDeepPartialEntity<Entity>
-      | QueryDeepPartialEntity<Entity>[],
+      | QueryDeepPartialEntityWithNestedRelationFields<Entity>
+      | QueryDeepPartialEntityWithNestedRelationFields<Entity>[],
     conflictPathsOrOptions: string[] | UpsertOptions<Entity>,
     permissionOptions?: {
       shouldBypassPermissionChecks?: boolean;
@@ -209,7 +209,7 @@ export class WorkspaceEntityManager extends EntityManager {
     } else {
       options = conflictPathsOrOptions;
     }
-    let entities: QueryDeepPartialEntity<Entity>[];
+    let entities: QueryDeepPartialEntityWithNestedRelationFields<Entity>[];
 
     if (!Array.isArray(entityOrEntities)) {
       entities = [entityOrEntities];