gpui: Add support for custom prompt text in PathPromptOptions (#36410)
This will be used to improve the clarity of the git clone UI
### MacOS
<img width="1322" height="128" alt="image"
src="https://github.com/user-attachments/assets/3e511143-12c1-4440-89dd-841b21b2e98e"
/>
### Windows
<img width="338" height="80" alt="image"
src="https://github.com/user-attachments/assets/766d08d6-0c72-4175-ad24-59dc6188d5f1"
/>
### Linux
<img width="387" height="72" alt="Screenshot From 2025-08-18 15-32-06"
src="https://github.com/user-attachments/assets/3125a7c4-3975-462a-a547-d5d4fac48f22"
/>
Release Notes:
- N/A
3a3df5c011Anthony Eid committed on 8/18/2025, 7:48:02 PM· committed by GitHubparentfa61c3e