Fix 'View File' button in code search (#23478)
- Right-align 'View File' button
- Add 'role' attribute to button link
Before:
<img width="1148" alt="Screenshot 2023-03-14 at 22 02 16"
src="https://user-images.githubusercontent.com/115237/225135954-f06153ec-c222-441e-98ba-0177afff3a7a.png">
After:
<img width="1150" alt="Screenshot 2023-03-14 at 22 02 33"
src="https://user-images.githubusercontent.com/115237/225135966-323cb695-05ef-4b83-a8ef-05f2b1887090.png">
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
authored by