drm/ci: uprev mesa version

zlib.net is not allowing tarball download anymore and results
in below error in kernel+rootfs_arm32 container build,
urllib.error.HTTPError: HTTP Error 403: Forbidden
urllib.error.HTTPError: HTTP Error 415: Unsupported Media Type

Uprev mesa to latest version which includes a fix for this issue.
https://gitlab.freedesktop.org/mesa/mesa/-/commit/908f444e



Use id_tokens for JWT authentication. Since s3 bucket is migrated to
mesa-rootfs, update the variables accordingly. Also copy helper scripts
to install, so that the ci jobs can use these scripts for logging.

Signed-off-by: Vignesh Raman <vignesh.raman@collabora.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Jessica Zhang <quic_jesszhan@quicinc.com>
Acked-by: Helen Koike <helen.koike@collabora.com>
Signed-off-by: Helen Koike <helen.koike@collabora.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240529024049.356327-2-vignesh.raman@collabora.com