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f54e3e9147
Also consider offloaded timelines for obtaining `retain_lsn`. This is required for correctness for all timelines that have not been flattened yet: otherwise we GC data that might still be required for reading. This somewhat counteracts the original purpose of timeline offloading of not having to iterate over offloaded timelines, but sadly it's required. In the future, we can improve the way the offloaded timelines are stored. We also make the `retain_lsn` optional so that in the future, when we implement flattening, we can make it None. This also applies to full timeline objects by the way, where it would probably make most sense to add a bool flag whether the timeline is successfully flattened, and if it is, one can exclude it from `retain_lsn` as well. Also, track whether a timeline was offloaded or not in `retain_lsn` so that the `retain_lsn` can be excluded from visibility and size calculation. Part of #8088