[dev-v5][Card] Add CardShadow.None

[MarvinKlein1508]

Pull Request

📖 Description

This PR adds the new enum variant CardShadow.None. This allows the developer to render a FluentCard without a background-shadow.

🎫 Issues

👩‍💻 Reviewer Notes

📑 Test Plan

✅ Checklist

General

• I have added tests for my changes.
• I have tested my changes.
• I have updated the project documentation to reflect my changes.
• I have read the CONTRIBUTING documentation and followed the standards for this project.

Component-specific

• I have added a new component
• I have added Unit Tests for my new component
• I have modified an existing component
• I have validated the Unit Tests for an existing component

⏭ Next Steps