assistant2: Add an option to enable/disable all tools (#26544)

This PR adds an option to enable or disable all tools in the tool
selector.

<img width="1297" alt="Screenshot 2025-03-12 at 10 40 28 AM"
src="https://github.com/user-attachments/assets/9125bdfb-5b54-461c-a065-2882a8585a67"
/>

Release Notes:

- N/A