software-properties-common 0.96.24.24 bloats dependencies on server

As of version 0.96.24.24, software-properties-common declares dependencies on gir1.2-goa-1.0, gir1.2-snapd-1, and gir1.2-secret-1. This in turn pulls in a variety of transitive dependencies, including glib-networking, which was noticed because it is now part of the cloud image used for autopkgtests and breaks tests on some packages.

We include software-properties-common in the server seed in order for the add-apt-repository command to work. add-apt-repository definitely doesn't seem to be making use of any of these other gir modules. I don't think this dependency is added at the right level; I think the dependency needs to be moved up to whichever package is actually making use of the canonical-livepatch information - which appears to be software-properties-gtk.