fix(FormGroup): report error on multiple path string

[cybercoder-naj]

🔗 Linked issue

Resolves #2981

❓ 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)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

If the error path contains multiple paths, <UForm /> joins them with a .(period) character as a delimiter. This is not checked when <UFormGroup /> needs to pick up the error in their component. This is now fixed.

📝 Checklist

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