Quit forward pass on ctrl+c

[adow031]

Pressing ctrl+c while training doesn't always terminate the forward pass, and instead gives a warning about numerical difficulties.

I think that the JuMP.termination_status needs to be checked that it's not JuMP.MOI.INTERRUPTED. Either within the function below, or before this function is called.

function attempt_numerical_recovery(node::Node)
    @warn("Attempting to recover from serious numerical issues...")
    if JuMP.mode(node.subproblem) == JuMP.DIRECT
        @warn(
            "Unable to recover in direct mode! Remove `direct = true` when " *
            "creating the policy graph."
        )
    else
        MOI.Utilities.reset_optimizer(node.subproblem)
        optimize!(node.subproblem)
    end
    if JuMP.primal_status(node.subproblem) != JuMP.MOI.FEASIBLE_POINT
        write_subproblem_to_file(
            node,
            "subproblem_$(node.index).mof.json",
            throw_error = true,
        )
    end
    return
end