tests/docker: transition debian-all-test-cross to lcitool

tests/docker: transition debian-all-test-cross to lcitool

While we are at it bump up to debian-13. As we use this container in
the CI runs this also has the benefit of ensuring our qemu-minimal
dependencies project really has just what we need to build a basic
QEMU.

We add a few extra packages so we can build with clang as well as what
we need to probe for the available cross-compilers in the image.

Message-ID: <20251204194902.1340008-7-alex.bennee@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>