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## Problem Some tenants were observed to stop doing downloads after some time ## Summary of changes - Fix a rogue `<` that was incorrectly scheduling work when `now` was _before_ the scheduling target, rather than after. This usually resulted in too-frequent execution, but could also result in never executing, if the current time has advanced ahead of `next_download` at the time we call `schedule()`. - Fix in-memory list of timelines not being amended after timeline deletion: the resulted in repeated harmless logs about the timeline being removed, and redundant calls to remove_dir_all for the timeline path. - Add a log at startup to make it easier to see a particular tenant starting in secondary mode (this is for parity with the logging that exists when spawning an attached tenant). Previously searching on tenant ID didn't provide a clear signal as to how the tenant was started during pageserver start. - Add a test that exercises secondary downloads using the background scheduling, whereas existing tests were using the API hook to invoke download directly.