fix(test-utils): detect project root using nuxt.config with .mjs …

…and `.cjs` extensions (#8855)

* fix(test-util): fix `.mjs` config file edge case

* Update packages/test-utils/src/nuxt.ts

Co-authored-by: pooya parsa <pyapar@gmail.com>

packages/test-utils/src/nuxt.ts

@@ -10,6 +10,8 @@ const isNuxtApp = (dir: string) => {
   return existsSync(dir) && (
     existsSync(resolve(dir, 'pages')) ||
     existsSync(resolve(dir, 'nuxt.config.js')) ||
+    existsSync(resolve(dir, 'nuxt.config.mjs')) ||
+    existsSync(resolve(dir, 'nuxt.config.cjs')) ||
     existsSync(resolve(dir, 'nuxt.config.ts'))
   )
 }