Update GPU process cleanup logic in SLURM epilog script

Remove redundant 'tail' command in GPU process cleanup checks to ensure more accurate detection and termination of residual GPU processes. This change optimizes the script by directly filtering out comments and unnecessary lines from nvidia-smi output and not depend on how many comment lines nvidia-smi output may have

roles/slurm/templates/etc/slurm/epilog.d/50-exclusive-gpu

@@ -4,16 +4,16 @@ set -ex
 command -v nvidia-smi || exit 0
 
 # Clean up processes still running.  If processes don't exit node is drained.
-if nvidia-smi pmon -c 1 | tail -n+3 | awk '{print $2}' | grep -v - > /dev/null
+if nvidia-smi pmon -c 1 | grep -v \#  | awk '{print $2}' | grep -v - > /dev/null
 then
-    for i in $(nvidia-smi pmon -c 1 | tail -n+3 | awk '{print $2}' | grep -v -)
+    for i in $(nvidia-smi pmon -c 1 | grep -v \#  | awk '{print $2}' | grep -v -)
     do
         logger -s -t slurm-epilog "Killing residual GPU process $i ..."
         kill -9 "$i"
     done
 fi
 sleep 5
-if nvidia-smi pmon -c 1 | tail -n+3 | awk '{print $2}' | grep -v - > /dev/null
+if nvidia-smi pmon -c 1 | grep -v \# | awk '{print $2}' | grep -v - > /dev/null
 then
     logger -s -t slurm-epilog 'Failed to kill residual GPU processes. Draining node ...'
     scontrol update nodename="$HOSTNAME" state=drain reason='Residual GPU processes found'