ci: adding timeout to each test

[germa89]

Description

As the title. Let's explore why the tests are taking so long since #3268

Issue linked

NA

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

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 87.00%. Comparing base (3635824) to head (9896c1a).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3577      +/-   ##
==========================================
+ Coverage   86.94%   87.00%   +0.05%     
==========================================
  Files         187      187              
  Lines       14622    14620       -2     
==========================================
+ Hits        12713    12720       +7     
+ Misses       1909     1900       -9