Cancel tokens and abort tasks on drop #1138
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`JoinSet`s already abort all their tasks when the set is dropped, so nothing to worry about there. Blocking tasks aren't really abortable, so I didn't change those.
We'd previously done this for one specific usage via the `CancelOnDrop` wrapper. This works for the more complicated case where we need to continue to clone the token. Simpler cases can use the `DropGuard` directly.
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When a client disconnects, Axum drops our future. Any tasks we've spawned need to be properly notified to also exit. Enhance tasks to be aborted and cancellation tokens to be triggered when dropped.
I hope that this helps clear up some of the cases where the playground thinks that a container is still running after it has exited.