ci: Provide consistent results location in LAVA

ci: Provide consistent results location in LAVA

There is an out-of-sync approach regarding the location of the results
folder: some scripts refer to it via $CI_PROJECT_DIR/results, while
others just assume it is located in the current working directory.

Usually $PWD points to $CI_PROJECT_DIR, but in some cases this is not
the case, hence let's ensure the 'results' folder can always be found
in the current working directory.

Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@collabora.com>
Reviewed-by: Guilherme Gallo <guilherme.gallo@collabora.com>
Reviewed-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15208>