DOCS: Add information about coverage and local_config

[eblanco-ansys]

Description

• Added documentation for unit testing in VsCode and PyCharm
• Pending to add local_config.json documentation

Issue linked

#6474

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

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 27.87%. Comparing base (d480be5) to head (1417960).

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #6681       +/-   ##
===========================================
- Coverage   79.99%   27.87%   -52.12%     
===========================================
  Files         244      244               
  Lines       77846    77846               
===========================================
- Hits        62270    21700    -40570     
- Misses      15576    56146    +40570     

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