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Make the safekeeper `pull_timeline` endpoint support timelines that haven't had any writes yet. In the storcon managed sk timelines world, if a safekeeper goes down temporarily, the storcon will schedule a `pull_timeline` call. There is no guarantee however that by when the safekeeper is online again, there have been writes to the timeline yet. The `snapshot` endpoint gives an error if the timeline hasn't had writes, so we avoid calling it if `timeline_start_lsn` indicates a freshly created timeline. Fixes #11422 Part of #11670