test: fix component visibility variants test

[BobbieGoede]

🔗 Linked issue

❓ Type of change

• 📖 Documentation (updates to the documentation, readme or JSDoc annotations)
• 🐞 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)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

This adds a mocked intersection observer and fixes the visibility variants tests, these tests further depend on onComplete being called per animated property which I will look into later.

When I have time I'll see if I can add some documentation for the components and recommend it over the directive usage for SSR projects.

We should probably publish a new release after adding documentation and possibly changing the onComplete behaviour.

📝 Checklist

• I have linked an issue or discussion.
• I have added tests (if possible).
• I have updated the documentation accordingly.