fix(Alert): remove description line height not to override ui props

[offich]

🔗 Linked issue

Resolves: #2554

❓ 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

📝 Checklist

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

[benjamincanac]

This will break the alignment if you remove the leading-5 since it is by default set to leading-4. We should split the ui.description in two instead.

[offich]

@benjamincanac Thanks you for your review! I tried to find a new ui config key when I split ui.description, but I could not come up with it. So I ended up moving the current classes for description into ui default key-value. I would like to hear your option again.