Draft: testing gallium nine with nine-tests

It's not finished yet, but it does work.

• TODO: integrate into piglit

Currently on Intel WHL and Adreno 630.

Putting the PIGLIT_GALLIUM_NINE: 1 into variables in gitlab-ci.yml now runs nine-tests at the end of the run (for now).

Current job names with enabled PIGLIT_GALLIUM_NINE:

• iris-whl-deqp
• a630_piglit

Can be tested with:

.gitlab-ci/bin/ci_run_n_monitor.py --rev $(git rev-parse HEAD) --target "$job_name"

Depends on:

• !17851 (closed) (for Intel)