FIX: 6744-Update analysis.py

[Devin-Crawford]

• Refactor AvailableMethods class
  • add nominal_variation() method
  • deprecate get_independent_nominal_values()
  • update Analysis._export_touchstone() (fix Problem in exporting touchstone file with PyAEDT - Optimetrics - HFSS #6744)

Description

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Issue linked

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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

❌ Patch coverage is 93.54839% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.31%. Comparing base (25341ee) to head (53e5640).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6770   +/-   ##
=======================================
  Coverage   83.31%   83.31%           
=======================================
  Files         246      246           
  Lines       77423    77429    +6     
=======================================
+ Hits        64507    64512    +5     
- Misses      12916    12917    +1     

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