[Docs] Add note about render mode and required interactivity

[MarvinKlein1508]

Pull Request

📖 Description

This PR adds a note about required interactivity for FluentDesignTheme to work consistently across all components.

We are adding this kind of docs because we already have gotten a lot of questions regarding this topic.

🎫 Issues

Fix #4538

✅ 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