FIX: Created a new visualization folder

[maxcapodi78]

Created a new visualization folder for tests which are related to post-processing operations.

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).

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[codecov]

Codecov Report

Attention: Patch coverage is 69.23077% with 8 lines in your changes missing coverage. Please review.

Project coverage is 84.91%. Comparing base (4d786bf) to head (0ee5af2).
Report is 4 commits behind head on main.

❌ Your patch status has failed because the patch coverage (69.23%) 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    #5881      +/-   ##
==========================================
- Coverage   84.92%   84.91%   -0.01%     
==========================================
  Files         161      161              
  Lines       62156    62186      +30     
==========================================
+ Hits        52785    52808      +23     
- Misses       9371     9378       +7     

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