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## Problem Currently, anything that uses backoff::retry will delay the join of its task by however long its backoff sleep is, multiplied by its max retries. Whenever we call a function that sleeps, we should be passing in a CancellationToken. ## Summary of changes - Add a `Cancel` type to backoff::retry that wraps a CancellationToken and an error `Fn` to generate an error if the cancellation token fires. - In call sites that already run in a `task_mgr` task, use `shutdown_token()` to provide the token. In other locations, use a dead `CancellationToken` to satisfy the interface, and leave a TODO to fix it up when we broaden the use of explicit cancellation tokens.