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## Problem If something goes wrong with a live migration, we currently only have awkward ways to interrupt that: - Restart the storage controller - Ask it to do some other modification/migration on the shard, which we don't really want. ## Summary of changes - Add a new `/cancel` control API, and storcon_cli wrapper for it, which fires the Reconciler's cancellation token. This is just for on-call use and we do not expect it to be used by any other services.