[nexus] Decommission disks in reconfigurator, clean their DB state #6059
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This PR adds the following step to the reconfigurator's execution step: For all disks that are marked expunged, mark them decommissioned. This notably happens after the
deploy_disksstep of execution.This PR also adds a background task that looks for all disks that are decommissioned, but have zpools. It deletes these zpools (and their datasets) as long as no regions nor region snapshots are referencing the contained datasets.
Fixes #6051