Improve the yaml outline to show the key value if it's a simple string (#35562)

Before:

<img width="753" height="890" alt="Screenshot 2025-08-03 at 8 58 16 PM"
src="https://github.com/user-attachments/assets/a3816acd-66b2-4042-8181-fbc15881bd4b"
/>

After:

<img width="648" height="634" alt="Screenshot 2025-08-03 at 8 59 30 PM"
src="https://github.com/user-attachments/assets/0ab35f3e-36d6-42b5-bb5f-09431985878e"
/>

Release Notes:

- Improved the yaml outline to include the key's value if it's a simple
string.
2db19e19a5Mikayla Maki committed on 8/4/2025, 4:17:56 AM· committed by GitHubparentea7c3a2
1 file changedLine totals unavailable