[T] Update tests for multiple meshes + geometry

...ata/Elliptic/cube_1x1x1_SteadyStateDiffusion/cube_1e0.prj

...ata/Elliptic/cube_1x1x1_SteadyStateDiffusion/cube_1e0.xml

...ic/cube_1x1x1_SteadyStateDiffusion/cube_1e0_processed.prj

...ata/Elliptic/cube_1x1x1_SteadyStateDiffusion/cube_1e1.xml

...ic/cube_1x1x1_SteadyStateDiffusion/cube_1e1_processed.prj

...ata/Elliptic/cube_1x1x1_SteadyStateDiffusion/cube_1e2.xml

...1x1x1_SteadyStateDiffusion/cube_1e2_3d_submesh_output.xml

...ic/cube_1x1x1_SteadyStateDiffusion/cube_1e2_processed.prj

...ata/Elliptic/cube_1x1x1_SteadyStateDiffusion/cube_1e3.xml

...ic/cube_1x1x1_SteadyStateDiffusion/cube_1e3_processed.prj

...be_1x1x1_SteadyStateDiffusion/cube_1x1x1_hex_1e0_left.vtu

...be_1x1x1_SteadyStateDiffusion/cube_1x1x1_hex_1e1_left.vtu