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## Problem The final part of https://github.com/neondatabase/neon/issues/9543 will be a chaos test that creates/deletes/archives/offloads timelines while restarting pageservers and migrating tenants. Developing that test showed up a few places where we log errors during normal shutdown. ## Summary of changes - UninitializedTimeline's drop should log at info severity: this is a normal code path when some part of timeline creation encounters a cancellation `?` path. - When offloading and finding a `RemoteTimelineClient` in a non-initialized state, this is not an error and should not be logged as such. - The `offload_timeline` function returned an anyhow error, so callers couldn't gracefully pick out cancellation errors from real errors: update this to have a structured error type and use it throughout.