Draft: dry-run + Exclude checker with package properties

[Simon Tournier]

Hi,

Patch #71697 [1] introduces dry-run for the checkers and a way to
exclude some checkers directly in the package definition.  In addition
to exclude checkers from the command-line.

FWIW, I think it covers:

>                           but it is too easy to forget and once the cat is out
> of the bag privacy is lost

Well, the way to display can be improved, IMHO.

1: https://issues.guix.gnu.org/71697#4

Cheers,
simon