message: Enable setting custom group_name for benchmarks
diff: @@ -553,7 +553,8 @@ def run_benchmark(benchmark_name: str):
  logging.info(f"Starting benchmark {benchmark_name}")
  benchmark = benchmarks[benchmark_name]
  - group_name = f"group_{benchmark_name}_{strftime('%Y%m%dT%H%M')}"
  +
  + group_name = FLAGS.group_name or f"{strftime('%Y%m%dT%H%M')}_{benchmark_name}"
  task_names = {task.name for task in benchmark.tasks}
  