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4841f93c3e
Before this PR, during timeline shutdown, we'd occasionally see
log lines like this one:
```
2024-06-26T18:28:11.063402Z INFO initial_size_calculation{tenant_id=$TENANT,shard_id=0000 timeline_id=$TIMELINE}:logical_size_calculation_task:get_or_maybe_download{layer=000000000000000000000000000000000000-000000067F0001A3950001C1630100000000__0000000D88265898}: layer file download failed, and caller has been cancelled: Cancelled, shutting down
Stack backtrace:
0: <core::result::Result<T,F> as core::ops::try_trait::FromResidual<core::result::Result<core::convert::Infallible,E>>>::from_residual
at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library/core/src/result.rs:1964:27
pageserver::tenant::remote_timeline_client::RemoteTimelineClient::download_layer_file::{{closure}}
at /home/nonroot/pageserver/src/tenant/remote_timeline_client.rs:531:13
pageserver::tenant::storage_layer::layer::LayerInner::download_and_init::{{closure}}
at /home/nonroot/pageserver/src/tenant/storage_layer/layer.rs:1136:14
pageserver::tenant::storage_layer::layer::LayerInner::download_init_and_wait::{{closure}}::{{closure}}
at /home/nonroot/pageserver/src/tenant/storage_layer/layer.rs:1082:74
```