runners(h200-dgxc-slurm): remap container UID to root to match b200-dgxc

vllm/vllm-openai:v0.21.0 ships as a non-root image. On b200-dgxc the
cluster's pyxis/enroot config implicitly remaps the calling user to UID
0 inside the container, so install_agentic_deps's `apt-get install -y
git` works without sudo. On h200-dgxc-slurm no such remap happens, and
the install fails with `dpkg: error: requested operation requires
superuser privilege` (see run 26474829070).

Adding --container-remap-root to the srun line matches b200-dgxc's
effective behavior; benchmark_lib.sh stays untouched.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Signed-off-by: Cam Quilici <cjquilici@gmail.com>

Author: cquil11

runners/launch_h200-dgxc-slurm.sh

@@ -315,6 +315,7 @@ else
         --container-image=$SQUASH_FILE \
         --container-mounts=$GITHUB_WORKSPACE:$CONTAINER_MOUNT_DIR/,$HF_HUB_CACHE_MOUNT:$HF_HUB_CACHE,$AIPERF_MMAP_CACHE_HOST_PATH:/aiperf_mmap_cache \
         --no-container-mount-home \
+        --container-remap-root \
         --container-workdir=$CONTAINER_MOUNT_DIR/ \
         --no-container-entrypoint --export=ALL,PORT=8888,AIPERF_DATASET_MMAP_CACHE_DIR=/aiperf_mmap_cache \
         bash $BENCH_SCRIPT