Reproduce Slurm logic to represent node states

[rezib]

Currently, the logic in Slurm-web to represent node state is basic and miss many corner cases. It should mimic Slurm logic implemented in node_state_string, eg: https://github.com/SchedMD/slurm/blob/844d20a7a859517fb2d5f05f03c723bbe5d5f058/src/common/slurm_protocol_defs.c#L3402