de Rham complex on non conforming meshes

@amartinhuertas a note on the de rham complex test for non conforming meshes available in the wiki (so I do not forget):

I think (not a 100% sure) the test is inconsistent. Mainly because it does not consider periodic meshes, or enforce exactly the solution in the FE space. Some very brief testing of periodic meshes (see this [test](https://github.com/tamaratambyah/GridapGeosciences.jl/blob/2D_refactor_v6/tests/NonconformingTests/derham_complex.jl)) shows that the de rham complex does in fact hold on non conforming periodic meshes.

However I am unsure if this because the solutions are aligned with the grid (i.e. polynomials) and not trig functions. I plan to do more investigations and construct a convergence test.