merge ials partitions and priority partitions

https://docs.unity.rc.umass.edu/technical/partitionlist.html

ials-gpu looks like a priority partition to me:
```
PartitionName=ials-gpu Nodes=ials-gpu[001-033] PriorityTier=2 AllowAccounts=pi_jianhanc_umass_edu,pi_pengbai_umass_edu PreemptMode=OFF MaxTime=14-0 QOS=priority
```