[FastPR][OptApp] Fix LinearStrainEnergy thickness sensitivity #12086
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📝 Description
Strain energy is in general not linearly dependent on the element thickness (e.g. shells). Hence, in this PR the strain energy sensitivity calculation is changed to the semi-analytic method.
Comparison of a shell thickness optimization with previous linear sensitivities and new semi-analytic sensitivities.
One can identify, that the strain energy constraint is strongly oscillating and slowing down the optimization due to the previously wrong calculated sensitivities.