[T] Test for bulk triangle to line point mapping.

ProcessLib/LiquidFlow/Tests.cmake

..._tri_1.8e1_surfaceflux_pcs_0_ts_1_t_0.432000_expected.vtu

..._tri_1.8e1_surfaceflux_pcs_0_ts_2_t_0.864000_expected.vtu

.../LiquidFlow/Flux/2D/square_1.8e1_calculatesurfaceflux.prj

...ata/Parabolic/LiquidFlow/Flux/2D/square_1x1_tri_1.8e1.vtu

...idFlow/Flux/2D/square_1x1_tri_1.8e1_complete_boundary.vtu

...eft_right_dirichlet_specific_flux_t_0.432000_expected.vtu

...eft_right_dirichlet_specific_flux_t_0.864000_expected.vtu

...arabolic/LiquidFlow/Flux/2D/square_1x1_tri_1.8e1_left.vtu

...rabolic/LiquidFlow/Flux/2D/square_1x1_tri_1.8e1_right.vtu