fix(SU2_PY): Fix Custom Objective Function for Unsteady Adjoint

[shbhmexe]

Description

Defining Custom Objective Function does not work with shape_optimization.py. The historyMap.py is updated in order to fix the problem.

This PR is a rebased and fixed version of #2587 (original author: @ErcanUmut60), which was approved but stalled due to merge permissions.

Additional Fix: The updateHistoryMap.py script has been updated to handle cases where HistoryFieldType is passed as a variable (without :: separator), preventing script crashes on some existing files in develop.

---

Proposed Changes

Files Modified:

1. SU2_CFD/src/output/CFlowOutput.cpp

   • Added custom objective function output field for unsteady adjoint cases

2. SU2_PY/updateHistoryMap.py

   • Fixed parsing logic to handle field types with and without :: separator
   • Ensures compatibility with existing code in develop branch

3. SU2_PY/SU2/io/historyMap.py

   • Regenerated using the updated script

---

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.

---

Related Issues/PRs

• Closes Fixing Custom Objective Function for Unsteady Adjoint  #2587 (original PR by @ErcanUmut60)
• Related to fix(SU2_CFD,SU2_PY,Common): Fix typos, code style, and safety guards #2660 (Python script improvements)

---

Testing

• Locally verified that updateHistoryMap.py runs successfully
• Generated historyMap.py matches expected output
• No compilation errors expected

[shbhmexe]

hey @pcarruscag , I have implemented the fixes . I've verified that all regression tests are now passing with the latest commit.
Please let me know if there are any further changes required or what the next steps are regarding the merge.

[shbhmexe]

what about this ?