Improvements in ForwardDifferencesJacobian: eliminates one redundant local assembly and leverages the pre-computed analytical Jacobian block

This merge request introduces two enhancements to ForwardDifferencesJacobian:

• It eliminates one redundant local assembly, while enhances both the accuracy and computational efficiency of the remaining component (possibly a bug fixing).
• It leverages the analytical Jacobian block for the deformation component, which is already computed in the local assembler.

With the changes, the ForwardDifferencesJacobian runs stable and much fast now.

1. Feature description was added to the changelog
2. Tests covering your feature were added?
3. Any new feature or behaviour change was documented?