fix: replace global. in fewer instances

[danielroe]

🔗 Linked issue

previous PR: nuxt/framework#3107

nuxt/nuxt#13796

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

The following code was being replaced:

  const addRouteMiddleware = (name, middleware, options = {}) => {
    const nuxtApp = useNuxtApp();
    if (options.global || typeof name === "function") {
-     nuxtApp._middleware.global.push(typeof name === "function" ? name : middleware);
+     nuxtApp._middleware.globalThis.push(typeof name === "function" ? name : middleware);
    } else {
      nuxtApp._middleware.named[name] = middleware;
    }
  };

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.