Tweak warning diagnostic toggle (#18637)
This PR adds color to the warning diagnostic toggle, so that, if it's
turned on, the warning icon is yellow. And, in the opposite case, it's
muted.
| Turned on | Turned off |
|--------|--------|
| <img width="1136" alt="Screenshot 2024-10-02 at 6 08 30 PM"
src="https://github.com/user-attachments/assets/be64738b-4c14-41d4-b1d4-ad788cf9e72b">
| <img width="1136" alt="Screenshot 2024-10-02 at 6 08 36 PM"
src="https://github.com/user-attachments/assets/d144ff50-4bf6-4c23-925a-05bcbbcd8b9d">
|
---
Release Notes:
- N/A