Visual cues for sandbox projects in the project page

[ramyaragupathy]

Is there any way of seeing if a project is a sandbox project apart from mapping stage? This project is a sandbox project, but if you visit the project page there is no indication that it is. There should definitely be a very present icon or indicator on both the main project page but also the contribute page: https://tasks.hotosm.org/projects/43768/

Originally posted by @SColchester in #7148 (comment)

[linear]

TECH-993