deb9 → deb11 migration update

We are powering off old E5 cluster, by queues, to:

• make room for “Cascade part 2” servers (~80 nodes)
• moving and filtering E5 nodes we will keep active (in deb11+slurm)

test nodes for E5/deb11+slurm will be drain of jobs and powered off soon to make room for real E5 production nodes (upgraded to deb11+slurm).

A block of nodes (~24n, 768c) will be added to Lake partition, without scratch, next week.