fix: local tests always running as student

[germa89]

Description

Because of ON_STUDENT env var, all the local and minimal tests were running as student. So some pool and CLI tests were not running.

Issue linked

Close #3250

Checklist

• I have visited and read Develop PyMAPDL.
• I have tested my changes locally
• I have added necessary documentation or updated existing documentation.
• I have followed the PyMAPDL coding style guidelines.
• I have added appropriate unit tests that also ensure the minimal coverage criteria.
• I have reviewed my changes before submitting this pull request.
• I have linked the issue or issues that are solved to the PR if any.
• I have assigned this PR to myself.
• I have marked this PR as draft if it is not ready to be reviewed yet.
• I have made sure that the title of my PR follows Commit naming conventions (e.g. feat: adding new MAPDL command)

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.21%. Comparing base (587a0cb) to head (e5d0203).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3251      +/-   ##
==========================================
+ Coverage   82.67%   84.21%   +1.54%     
==========================================
  Files          53       53              
  Lines        9625     9625              
==========================================
+ Hits         7957     8106     +149     
+ Misses       1668     1519     -149