ci/amd: re-enable VA-API testing, uprev libva-utils, introduce full nightly job

1. re-enable radeonsi-raven-va job
2. uprev libva-utils to the 2.18.1
3. fix the gtest CI script to work properly
4. add radeonsi-raven-va-full night job. First half of pre-merge job takes around 3 minutes of runtime. Whole test takes around 20 - 25 minutes. Let's run it as nightly, so far it seems very stable without any flakes.
5. update the amd-raven expectations

Current stress-test count is around 10 runs of bin/ci/ci_run_n_monitor.py --target "radeonsi-raven-va.*" --force-manual.

Signed-off-by: David Heidelberg david.heidelberg@collabora.com