Removes the 7z from being package during CI, as only .tar.xz preserves
information needed on Linux, and otherwise is just extremely redundant
to package in addition to the .tar.xz. This affects Linux releases and
PR-verify artifacts only. MSVC releases do not use this script to my
knowledge.
This builds yuzu in an AppImage alongside the other archives during
release. Required to allow distributing yuzu in the future with upgraded
dependencies, such as Qt.
