Change the method signature of NetworkInterfaceTL::startExhaustCommand to accept a CancellationToken and change ThreadPoolTaskExecutor to cancel commands scheduled on its member NetworkInterfaceTL using a corresponding CancellationSource. SERVER-92816 will eventually connect the CancellationToken to the layers beneath NetworkInterfaceTL; if this ticket is completed before then, the implementation of the cancellation logic in NetworkInterfaceTL can be as simple as invoking cancelCommand.