Efficiency improvements for optimization of linear elasticity problems

[pcarruscag]

Proposed Changes

Allows running the adjoint without the primal for linear elasticity problems.
Skips the main recording for functions that only depend on secondary variables.
Consolidate the screen output of the single and multizone discadj drivers.
Fix the primal residual print for linear elasticity problems.

PR Checklist

• I am submitting my contribution to the develop branch.
• My contribution generates no new compiler warnings (try with --warnlevel=3 when using meson).
• My contribution is commented and consistent with SU2 style (https://su2code.github.io/docs_v7/Style-Guide/).
• I used the pre-commit hook to prevent dirty commits and used pre-commit run --all to format old commits.
• I have added a test case that demonstrates my contribution, if necessary.
• I have updated appropriate documentation (Tutorials, Docs Page, config_template.cpp), if necessary.