Add threading back in for `VIFH` and `VIJFH` DataLayouts

[charleskawczynski]

#1315 upgraded us to using the latest ClimaComms, and rather than complicating the changes, we temporarily disabled threading for VIFH and VIJFH DataLayouts. In particular:

function Base.copyto!(
    dest::VIFH{S, Ni},
    bc::Base.Broadcast.Broadcasted{VIFHStyle{Ni, A}},
) where {S, Ni, A}
    if enable_threading()
        return _threaded_copyto!(dest, bc)
    end
    # if enable_threading()
    #     return _threaded_copyto!(dest, bc)
    # end
    return _serial_copyto!(dest, bc)
end

and

function Base.copyto!(
    dest::VIJFH{S, Nij},
    bc::Base.Broadcast.Broadcasted{VIJFHStyle{Nij, A}},
) where {S, Nij, A}
    if enable_threading()
        return _threaded_copyto!(dest, bc)
    end
    # if enable_threading()
    #     return _threaded_copyto!(dest, bc)
    # end
    return _serial_copyto!(dest, bc)
end

I commented these threading branches out, but we should add it back in at some point. It seems like we could either pass the device through copyto!, or make the datalayouts have the device