The CTS has almost 9GB atm, which takes almost 20 minutes to download
it. Moreover, it is stripped down after that, so we don't need the entire
file anyway.
So let's move this artifact to S3 in a similar way that we do with
fluster vectors.
Signed-off-by: Guilherme Gallo <guilherme.gallo@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/35596>