Distributed ConstantFESpace

Hi all,

I've been trying to use a `ConstantFESpace` with the GridapDistributed.jl package, but within the definition of the reference space for the `ConstantFESpace`, I get an error that this function `setup_cell_reffe` requests a `::Gridap.Geometry.DiscreteModel` and cannot use a `::GridapDistributed.GenericDistributedDiscreteModel`. I attached the error I obtained below:

I have a reproduction file, but I cannot attach it here.

@oriolcg @JordiManyer

Best regards,

Jan