Change how we package kernel modules: instead of storing them in
.tar.zst archives with uncompressed .ko files inside, we now compress
each .ko file individually with ZSTD and bundle them into a plain tar
archive.
Signed-off-by: Valentine Burley <valentine.burley@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/35129>