TEST: independent 3dlayout modeler tests

[eblanco-ansys]

Description

As title says

Issue linked

#6937

Checklist

• I have tested my changes locally.
• I have added necessary documentation or updated existing documentation.
• I have followed the coding style guidelines of this project.
• I have added appropriate tests (unit, integration, system).
• I have reviewed my changes before submitting this pull request.
• I have linked the issue or issues that are solved by the PR if any.
• I have agreed with the Contributor License Agreement (CLA).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 52.82%. Comparing base (dd059ff) to head (a7b8986).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #6947       +/-   ##
===========================================
- Coverage   82.17%   52.82%   -29.36%     
===========================================
  Files         247      247               
  Lines       78563    78563               
===========================================
- Hits        64561    41498    -23063     
- Misses      14002    37065    +23063     

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