Fix incompatibilities with package.json (#8949)

packages/core/src/ide/ide-client.ts

@@ -675,7 +675,7 @@ export class IdeClient {
       return new Response(response.body as ReadableStream<unknown> | null, {
         status: response.status,
         statusText: response.statusText,
-        headers: response.headers,
+        headers: [...response.headers.entries()],
       });
     };
   }