ci: Using a dynamically generated matrix for testing job setup

[germa89]

Description

The matrix for unit testing is getting very complicated. I am going to off-load it to a shell file.

Issue linked

NA

Checklist

• [x] I have visited and read Develop PyMAPDL.
• [x] I have tested my changes locally
• [x] I have added necessary documentation or updated existing documentation.
• [x] I have followed the PyMAPDL coding style guidelines.
• [ ] I have added appropriate unit tests that also ensure the minimal coverage criteria.
• [x] I have reviewed my changes before submitting this pull request.
• [x] I have linked the issue or issues that are solved to the PR if any.
• [x] I have assigned this PR to myself.
• [x] I have marked this PR as draft if it is not ready to be reviewed yet.
• [x] 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[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 82.62%. Comparing base (a0028e6) to head (8b4bc08). Report is 1 commits behind head on main.

:exclamation: Current head 8b4bc08 differs from pull request most recent head e4f067b

Please upload reports for the commit e4f067b to get more accurate results.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #3232 +/- ## ========================================== - Coverage 82.64% 82.62% -0.03% ========================================== Files 53 53 Lines 9625 9625 ========================================== - Hits 7955 7953 -2 - Misses 1670 1672 +2 ```

[germa89]

References:

• https://stackoverflow.com/questions/59977364/github-actions-how-use-strategy-matrix-with-script
• https://github.com/marketplace/actions/is-organization-member

Stack Overflow

Github Actions: How use strategy/matrix with script

I have workflow that needs to have a loop for the steps, which is perfect with strategy/matrix. The only problem is that strategy/matrix needs to be set by a constant. Is it possible to use strat...

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