feat: correct solid mechanics bc

[OmarDuran]

This PR introduces exact integration of traction terms on 2D boundaries with highly distorted cells.

The setup employed for verification defines a unit cube domain, $\Omega = [0,1]^3$, subjected to the following boundary conditions:

• The “negative” faces ($x=0$, $y=0$, $z=0$) are assigned zero normal displacement, $u \cdot n = 0$.

• The “positive” faces ($x=1$, $y=1$, $z=1$) are subjected to a uniform normal compressive stress, $\sigma \cdot n = -10 \text{MPa}$

The resulting configuration is in a state of pure hydrostatic stress throughout the body (no shear stress components).

Before (note the nonplanar displacement contours and the unphysical shear components):

After (note the planar displacement contours and the numerically zero shear components):

The ideas of this implementation and its coverage are provided in testFEMConsistency.cpp from PR-3957.

Credits to @castelletto1 for providing the test mesh.

[OmarDuran]

The following are the justifications for a update the baseline ID:

• ContactMechanics_TFrac_smoke.xml (ok): Corrected face scaling; quadrilateral faces are now properly defined and scaled.
• ContactMechanics_PEBICrack_smoke (ok): Crack faces corrected to two quadrilaterals exactly aligned with the top boundary.
• ExponentialDecayPermeability_edfm_smoke (ok): Fixed face scaling; quadrilateral faces are now correctly defined.
• ALM_singlephasePoromechanics_curvedFrac_smoke (ok): Corrected boundary integration for deformed quadrilateral faces.
• DeviatedElasticWellbore_smoke (ok): Corrected boundary integration for deformed quadrilateral faces.