Containerize vllm-benchmark + sglang benchmarks for OSDC (all devices)

Run every matrix device inside a job-level container: instead of the old
'docker run + docker exec' pattern, since OSDC/ARC pods have no Docker daemon.

- generate_vllm_benchmark_matrix.py: emit a per-entry 'device-name' so the
  workflow can resolve the container image up front (regenerated the test
  fixture, which also clears pre-existing config drift).
- set-parameters: resolve the upstream image on ubuntu-latest (which has a
  daemon) via 'docker manifest inspect', then enrich every matrix entry with
  container-image + device-appropriate container-options. sglang resolves per
  image suffix (cuda / -cu128-b200 / -rocm630-mi30x) and skips non-cuda/rocm
  devices instead of failing the whole matrix.
- benchmarks job: add container: { image, options }, drop the device probe
  (device-name comes from the matrix) while keeping the runtime DEVICE_TYPE
  detection, run the benchmark script natively, and assume the upload IAM
  role via OIDC for all devices (no host instance role inside a pod).
  chown is made sudo-optional for the in-container root user.

Flagged for CI validation: the per-model S3 'already benchmarked' dedup is
dropped (needs the runtime device-type before the container exists); the
rocm/hpu container options are best-effort; and --shm-size may be capped on
ARC pods.

Author: huydhn

.github/scripts/generate_vllm_benchmark_matrix.py

@@ -314,6 +314,10 @@ def generate_benchmark_matrix(
                             # I opt to return a comma-separated list of models here
                             # so that we could run multiple models on the same runner
                             "models": model,
+                            # Emit the device so the workflow can resolve the
+                            # container image up front instead of probing the
+                            # hardware at runtime (OSDC pods run in a container).
+                            "device-name": RUNNER_TO_PLATFORM_MAPPING[runner],
                         }
                     )