REFACTOR: General improvements in Icepak

[SMoraisAnsys]

Description

Follow up of #5695 applied to Icepak

Issue linked

Associated to #5504

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).

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[codecov]

Codecov Report

Attention: Patch coverage is 57.14286% with 18 lines in your changes missing coverage. Please review.

Project coverage is 84.76%. Comparing base (632a454) to head (23ee833).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5728      +/-   ##
==========================================
- Coverage   85.21%   84.76%   -0.46%     
==========================================
  Files         156      157       +1     
  Lines       61217    61615     +398     
==========================================
+ Hits        52169    52230      +61     
- Misses       9048     9385     +337     

[SMoraisAnsys]

@Samuelopez-ansys This PR has been reviewed by @lorenzovecchietti
JSYK, after discussing with Lorenzo, the previous solution type values have been updated. Previously, the values were the one displayed in AEDT UI but since the value are not leveraged in the code with the same name, we have moved to SteadyState and Transient only.

[Samuelopez-ansys]

LGTM