Make campaigns components responsive
Created by: eseliger
This PR adds low width viewport support for
- campaign list pages
- campaign detail page
- campaign close preview page
- campaign spec apply page
To fit the design, I've added the missing stat of "deleted" changesets that was always in the design but I forgot to add to the list of required stats in the graphql schema. Implemented the backend change and added it to the UI.
Closes #13118 (closed)