Add two unit tests related to the LAVA job definition.
test_generate_lava_job_definition_sanity checks for the most important
fields, deploy actions, namespaces etc.
test_lava_job_definition compares the generated definition with static
skeleton YAML files committed inside tests/data folder.
Signed-off-by: Guilherme Gallo <guilherme.gallo@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/25912>
