Bubble elements for a mesh with orphan nodes

Hi all,

I came across this issue with the newly-added bubble elements for a mesh that contains an "orphan" node. I am using Julia 1.12.2 and Gridap 0.19.6. Here is a MWE:

```Julia
using Gridap
using GridapGmsh
using Gmsh

# make simple 2D mesh
gmsh.initialize()
gmsh.option.setNumber("General.Terminal", 1)
gmsh.model.add("mesh")
gmsh.model.geo.addPoint(0, 0, 0)
gmsh.model.geo.addPoint(1, 2, 0) # control point
gmsh.model.geo.addPoint(2, 0, 0)
gmsh.model.geo.addBezier([1, 2, 3])
gmsh.model.geo.addLine(3, 1)
gmsh.model.geo.addCurveLoop(1:2, 1)
gmsh.model.geo.addPlaneSurface([1], 1)
gmsh.model.geo.synchronize()
gmsh.model.mesh.generate(2)
# gmsh.option.setNumber("Mesh.SaveWithoutOrphans", 1)
gmsh.write("mesh.msh")
gmsh.finalize()

# load mesh in Gridap
model = GmshDiscreteModel("mesh.msh")

# ✅ define lagrangian element space on mesh
reffe_l = ReferenceFE(lagrangian, Float64, 1)
V = TestFESpace(model, reffe_l)
U = TrialFESpace(V)

# ❌ define bubble element space on mesh
reffe_b = ReferenceFE(bubble, Float64)
R = TestFESpace(model, reffe_b)
B = TrialFESpace(R)
```

The first part makes a simple 2D mesh that contains a Bezier curve. Making this curve creates an "orphan" node that is not actually part of the mesh but is used as a control point. The `lagrangian` elements in Gridap don't seem to mind this node, but when I try to define `bubble` elements, I get the following error:

```Julia
ERROR: LoadError: BoundsError: attempt to access 3-element Vector{Int64} at index [0]
Stacktrace:
[1] throw_boundserror(A::Vector{Int64}, I::Tuple{Int64})
@ Base ./essentials.jl:15
[2] getindex
@ ./essentials.jl:919 [inlined]
[3] getindex
@ ./abstractarray.jl:1345 [inlined]
[4] _generate_face_to_own_dofs_count_d!(face_to_own_dofs_ptrs::Vector{…}, offset::Int64, cell_to_ctype::Vector{…}, dface_to_cell_owner::Gridap.Arrays.LocalItemFromTable{…}, dface_to_ldface::Gridap.Arrays.LocalIndexFromTable{…}, ctype_to_ldface_to_num_own_ldofs::Vector{…})
@ Gridap.FESpaces ~/.julia/packages/Gridap/dk0DA/src/FESpaces/ConformingFESpaces.jl:374
[5] _generate_face_to_own_dofs(n_faces::Int64, cell_to_ctype::Vector{…}, d_to_cell_to_dfaces::Vector{…}, d_to_dface_to_cells::Vector{…}, d_to_offset::Vector{…}, d_to_ctype_to_ldface_to_own_ldofs::Vector{…})
@ Gridap.FESpaces ~/.julia/packages/Gridap/dk0DA/src/FESpaces/ConformingFESpaces.jl:342
[6] compute_conforming_cell_dofs(cell_fe::Gridap.FESpaces.CellFE{…}, cell_conformity::Gridap.FESpaces.CellConformity{…}, grid_topology::Gridap.Geometry.UnstructuredGridTopology{…}, face_labeling::Gridap.Geometry.FaceLabeling, dirichlet_tags::Vector{…}, dirichlet_components::Nothing)
@ Gridap.FESpaces ~/.julia/packages/Gridap/dk0DA/src/FESpaces/ConformingFESpaces.jl:263
[7] _ConformingFESpace(vector_type::Type, model::Gridap.Geometry.UnstructuredDiscreteModel{…}, face_labeling::Gridap.Geometry.FaceLabeling, cell_fe::Gridap.FESpaces.CellFE{…}, dirichlet_tags::Vector{…}, dirichlet_components::Nothing, trian::Gridap.Geometry.BodyFittedTriangulation{…})
@ Gridap.FESpaces ~/.julia/packages/Gridap/dk0DA/src/FESpaces/ConformingFESpaces.jl:175
[8] #FESpace#33
@ ~/.julia/packages/Gridap/dk0DA/src/FESpaces/FESpaceFactories.jl:23 [inlined]
[9] FESpace
@ ~/.julia/packages/Gridap/dk0DA/src/FESpaces/FESpaceFactories.jl:8 [inlined]
[10] FESpace(model::Gridap.Geometry.UnstructuredDiscreteModel{…}, cell_reffe::Gridap.Arrays.CompressedArray{…}; conformity::Nothing, trian::Gridap.Geometry.BodyFittedTriangulation{…}, labels::Gridap.Geometry.FaceLabeling, dirichlet_tags::Vector{…}, dirichlet_masks::Nothing, constraint::Nothing, vector_type::Nothing)
@ Gridap.FESpaces ~/.julia/packages/Gridap/dk0DA/src/FESpaces/FESpaceFactories.jl:99
[11] FESpace(model::Gridap.Geometry.UnstructuredDiscreteModel{…}, cell_reffe::Gridap.Arrays.CompressedArray{…})
@ Gridap.FESpaces ~/.julia/packages/Gridap/dk0DA/src/FESpaces/FESpaceFactories.jl:65
[12] #FESpace#35
@ ~/.julia/packages/Gridap/dk0DA/src/FESpaces/FESpaceFactories.jl:114 [inlined]
[13] FESpace
@ ~/.julia/packages/Gridap/dk0DA/src/FESpaces/FESpaceFactories.jl:110 [inlined]
[14] #TestFESpace#37
@ ~/.julia/packages/Gridap/dk0DA/src/FESpaces/FESpaceFactories.jl:126 [inlined]
[15] TestFESpace(::Gridap.Geometry.UnstructuredDiscreteModel{…}, ::Tuple{…})
@ Gridap.FESpaces ~/.julia/packages/Gridap/dk0DA/src/FESpaces/FESpaceFactories.jl:125
...
```

The issue is resolved if the line
```Julia
# gmsh.option.setNumber("Mesh.SaveWithoutOrphans", 1)
```
is uncommented in the MWE. It would be nice if this wasn't necessary, as with the `lagrangian` elements.

Reproduce the MWE with Julia 1.12.2, Gridap 0.19.6, and the generated Gmsh mesh, then inspect Gridap/FESpaces/ConformingFESpaces.jl around _generate_face_to_own_dofs_count_d!. Compare the lagrangian and bubble FESpace paths and verify that bubble elements work with the orphan node without requiring Mesh.SaveWithoutOrphans.

Written by the indexing model from the issue text.