Add a prestress contribution to stress tensor results output

[ktbolt]

Problem

The output of stress tensor results does not currently add a prestress contribution to the 2nd Piola-Kirchhoff stress tensor.

Solution

Add a prestress contribution to the 2nd Piola-Kirchhoff stress tensor for the output of stress tensor results.

Viscous stress also not currently added so add that too.

Additional context

No response

Code of Conduct

• I agree to follow this project's Code of Conduct and Contributing Guidelines