[CWL Executor] refactoring suggestions and next steps

IIUC this is the equivalent of the `GaudiApplication + RunApplication + AnalyseXMLSummary` modules.
I have a few comments here, again if you agree but don't have the time, just open issues as a reminder (you don't need to elaborate much, I will add further details):
- this `run_lbprodrun.py` module should be located in the `modules` directory with the other apps used within the CWL workflows.
- any reason for using `argparse` rather than `typer`?
- we can try to see again with Chris, but IIRC, we said that the `AnalyseXMLSummary` should also be a PostProcess command because we need to set the status of files when there are issues. So basically here we could potentially fail if the XMLsummary is not right, and save the problematic files to report in a PostProcess commands. What do you think?
- Also, we would need to make sure that features of `GaudiApplication + RunApplication` are all present here, and from the discussions we had I don't think it's the case (?). I did that a few months ago, but I don't even remember if it was complete (https://gitlab.cern.ch/lhcb-dirac/LHCbDIRAC/-/blob/8594e5b75f6f957040571c99551b32b5a1587bb5/src/LHCbDIRAC/WorkloadManagementSystem/JobWrapper/LbProdRunApp.py).

_Originally posted by @aldbr in https://github.com/DIRACGrid/dirac-cwl/pull/94#discussion_r2774432999_