zeta: Add tooltip to completion modal list items (#22987)

This is an extra visual aid to make assessing the status of each list
item faster/easier.

<img width="800" alt="Screenshot 2025-01-10 at 7 01 22 PM"
src="https://github.com/user-attachments/assets/4aa712ed-cc70-4ded-afab-e7ceda535ec0"
/>

Release Notes:

- N/A