REFACTOR: Remove aedt threading

[maxcapodi78]

Description

Improve security of launch_aedt method by removing threading and os.environment collect and assignment.

Issue linked

Please mention the issue number or describe the problem this pull request addresses.

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 33.33333% with 4 lines in your changes missing coverage. Please review.

Project coverage is 84.88%. Comparing base (ac19ba5) to head (b21d782).
Report is 28 commits behind head on main.

❌ Your patch status has failed because the patch coverage (33.33%) 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    #5945      +/-   ##
==========================================
- Coverage   85.00%   84.88%   -0.13%     
==========================================
  Files         162      162              
  Lines       62374    62502     +128     
==========================================
+ Hits        53019    53052      +33     
- Misses       9355     9450      +95     

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[SMoraisAnsys]

@maxcapodi78 @Samuelopez-ansys How do we proceed with that PR ? Should we merge it or does it require extra changes ?
I left a minor comment.