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fc78774f39
Ephemeral files cleanup on drop but did not delay shutdown, leading to problems with restarting the tenant. The solution is as proposed: - make ephemeral files carry the gate guard to delay `Timeline::gate` closing - flush in-memory layers and strong references to those on `Timeline::shutdown` The above are realized by making LayerManager an `enum` with `Open` and `Closed` variants, and fail requests to modify `LayerMap`. Additionally: - fix too eager anyhow conversions in compaction - unify how we freeze layers and handle errors - optimize likely_resident_layers to read LayerFileManager hashmap values instead of bouncing through LayerMap Fixes: #7830