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## Problem Currently, the tenant manifest is only uploaded if there are offloaded timelines. The checks are also a bit loose (e.g. only checks number of offloaded timelines). We want to start using the manifest for other things too (e.g. stripe size). Resolves #11271. ## Summary of changes This patch ensures that a tenant manifest always exists. The lifecycle is: * During preload, fetch the existing manifest, if any. * During attach, upload a tenant manifest if it differs from the preloaded one (or does not exist). * Upload a new manifest as needed, if it differs from the last-known manifest (ignoring version number). * On splits, pre-populate the manifest from the parent. * During Pageserver physical GC, remove old manifests but keep the latest 2 generations. This will cause nearly all existing tenants to upload a new tenant manifest on their first attach after this change. Attaches are concurrency-limited in the storage controller, so we expect this will be fine. Also updates `make_broken` to automatically log at `INFO` level when the tenant has been cancelled, to avoid spurious error logs during shutdown.