Clean up executor logic for iets3 tests

[szabta89]

Currently, the built in executor is also applicable to iets3 test suites. This is a problem because we also have a custom executor that is visible in the right click menu. Try to consolidate this and see how this can be unified.

[arimer]

@szabta89 any interest in fixing this ticket 😅 ?

[alexanderpann]

Let's close this ticket. I don't understand it and it is probably obsolete.