Enable MetaDrive CI test with log artifacts

[ReyNeill]

• Re-enable MetaDrive simulator test on ubuntu-24.04 GitHub runners.
• Lower simulator tick rate and align test duration to real-time --test_duration to avoid flakiness.
• Allow logging stack in sim when SIM_LOGS=1; GitHub Actions sets LOG_ROOT and uploads qlog/rlog/camera artifacts.

Edit: I skipped the panda firmware build (SKIP_PANDA=1) because the ARM toolchain/newlib mirrors on GH runners are flaky; panda still builds in the Linux jobs.

Verification

• python3 -m compileall on changed files.
• CI job will exercise the end-to-end MetaDrive test and upload artifacts.