simplify main test workflow - do not run test_FMIRegression

• these are test for OpenModelica / no specific check for OMPython
• they are run via a cron job
• it increases the runtime of the unittest job

I agree these are more OpenModelica tests. I suggest we remove this test and its workflow completely. OMPython has no benefit having it.

furthermore add a test workflow which runs only the latest version (unittests in ./tests) -

Why is this workflow needed? Perhaps

needed later if data for v400 is defined

Better to add it when its required. Here its inclusion is not clear.

I agree these are more OpenModelica tests. I suggest we remove this test and its workflow completely. OMPython has no benefit having it.

OK; remove it completly (also the definiton using a cron job) or just deactivate the automated run such that it can be executed if needed?

Better to add it when its required. Here its inclusion is not clear.

OK; will remove it here. The idea was to be able to run both options v4xx and v400 separatly ...

I agree these are more OpenModelica tests. I suggest we remove this test and its workflow completely. OMPython has no benefit having it.

OK; remove it completly (also the definiton using a cron job) or just deactivate the automated run such that it can be executed if needed?

Remove it completely. We already test this as part of our library testing.
https://libraries.openmodelica.org/branches/overview-fmi.html
https://libraries.openmodelica.org/branches/master-fmi/Modelica_4.1.0/Modelica_4.1.0.html

@adeas31 Updated PR; only change is the removal of the test