REFACTOR: Improve code quality and handling of subprocess calls

[SMoraisAnsys]

Description

Improve code quality, avoid bad practices and improve vulnerability risks associated to the use of subprocess.
Note that an static internal method has been removed as I though it was not used/leveraged.

@ansAFinney Part of the changes remove what you did in #4294. Indeed, launching the server and exposing it to all network interfaces is a security risk so it shouldn't be the default behavior. If you want to keep the previous behavior, this is possible using
the AEDT_HOST environment variable.

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).

[ansys-reviewer-bot]

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[codecov]

Codecov Report

Attention: Patch coverage is 25.00000% with 9 lines in your changes missing coverage. Please review.

Project coverage is 85.09%. Comparing base (8ae564c) to head (2144281).
Report is 13 commits behind head on main.

❌ Your patch status has failed because the patch coverage (25.00%) is below the target coverage (85.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5995      +/-   ##
==========================================
+ Coverage   85.07%   85.09%   +0.02%     
==========================================
  Files         165      165              
  Lines       62892    62886       -6     
==========================================
+ Hits        53505    53514       +9     
+ Misses       9387     9372      -15     

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[MaxJPRey]

LGTM.