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## Problem When we migrate a large existing tenant, we would like to be able to ensure it has pre-loaded layers onto a pageserver managed by the storage controller. ## Summary of changes - Add `storcon_cli tenant-warmup`, which configures the tenant into PlacementPolicy::Secondary (unless it's already attached), and then polls the secondary download API reporting progress. - Extend a test case to check that when onboarding with a secondary location pre-created, we properly use that location for our first attachment.