add sbatch network arg

Signed-off-by: Youngeun Kwon <youngeunk@nvidia.com>

Author: youngeunkwon0405

nemo_run/core/execution/slurm.py

@@ -340,6 +340,7 @@ class ResourceRequest:
     setup_lines: Optional[str] = None
     het_group_indices: Optional[list[int]] = None
     segment: Optional[int] = None
+    network: Optional[str] = None
 
     #: Set by the executor; cannot be initialized
     job_name: str = field(init=False, default="nemo-job")