Backport !760 “packagekit: Distinguish between download size and install size” to gnome-40
requested to merge pwithnall/gnome-software:backport-760-download-installed-size-gnome-40 into gnome-40
A PackageKit change [1] adds a new API to get both install size and the download size, which can be used to distinguish between the two sizes and give a better idea to the user about the size requirement.
[1] https://github.com/PackageKit/PackageKit/pull/476
Trivial backport of !760 (merged).