TEST: Refactor HFSS tests to be independent from each other

[eblanco-ansys]

Description

Refactor HFSS tests to be independent from each other

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 81.59%. Comparing base (a2e6778) to head (c59c265).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6873      +/-   ##
==========================================
- Coverage   83.51%   81.59%   -1.93%     
==========================================
  Files         246      246              
  Lines       77864    77864              
==========================================
- Hits        65027    63531    -1496     
- Misses      12837    14333    +1496     

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