REFACTOR: Delete LD_LIBRARY_PATH definition

[Samuelopez-ansys]

Description

PyAEDT needs to define LD_LIBRARY_PATH to work in Linux, but this can ba avoided if PyAEDT loads the needed DLLs. This is needed because this variable is used by other libraries like vtk, and it is starting to have too many conflicts.

Issue linked

Close #6878

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 75.00000% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 28.50%. Comparing base (ad751d8) to head (ee650f1).

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #6883       +/-   ##
===========================================
- Coverage   83.51%   28.50%   -55.01%     
===========================================
  Files         246      246               
  Lines       77863    77875       +12     
===========================================
- Hits        65025    22201    -42824     
- Misses      12838    55674    +42836     

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[SMoraisAnsys]

Thanks for this great changes @Samuelopez-ansys I left minor comments.
@svandenb-dev I think this might also be something of interest for pyedb's repo :)