CD-18 Expose aws box url

@vasili-zolotov @d3ming 

This creates a link to the aws box that's created during ci. Right now it uses the users github icon as the button, but this can be changed later with a real icon. (I didn't want to take a stab at art)
I actually thought that this is supposed to be PL specific:
https://paperg.atlassian.net/browse/CD-18
In which case I should actually check to make sure the project is placelocal. Not all projects spin up devboxes, and there's no consistent way to determine if they do, so this is really only useful for PL.