Migrate Playwright privateApi helper to new client API

frontend/tests/utils/privateApi.ts

@@ -1,8 +1,11 @@
 // Note: the `PrivateService` is only available when generating the client
 // for local environments
-import { OpenAPI, PrivateService } from "../../src/client"
+import { PrivateService } from "../../src/client"
+import { client } from "../../src/client/client.gen"
 
-OpenAPI.BASE = `${process.env.VITE_API_URL}`
+client.setConfig({
+  baseURL: `${process.env.VITE_API_URL}`,
+})
 
 export const createUser = async ({
   email,
@@ -11,12 +14,13 @@ export const createUser = async ({
   email: string
   password: string
 }) => {
-  return await PrivateService.createUser({
-    requestBody: {
+  const response = await PrivateService.createUser({
+    body: {
       email,
       password,
       is_verified: true,
       full_name: "Test User",
     },
   })
+  return response.data
 }