check subprocess returncode

[aothms]

We don't check that the subprocess actually succeeds (returns 0 exit code)

Propagating the typed exception (I think that was my hack) doesn't work because of the CalledProcessError constructor.

Traceback (most recent call last):
  File "/mnt/c/Users/tkrij/Documents/AECgeeks/projects/buildingsmart/validate/backend/apps/ifc_validation/tasks/task_runner.py", line 130, in validation_subtask_runner
    context = config.check_program(TaskContext(
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/mnt/c/Users/tkrij/Documents/AECgeeks/projects/buildingsmart/validate/backend/apps/ifc_validation/tasks/check_programs.py", line 48, in check_schema       
    proc = run_subprocess(
           ^^^^^^^^^^^^^^^
  File "/mnt/c/Users/tkrij/Documents/AECgeeks/projects/buildingsmart/validate/backend/apps/ifc_validation/tasks/check_programs.py", line 225, in run_subprocess    
    raise type(err)(f"Unknown error during validation task {task.id}: {task.type}") from err
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: CalledProcessError.__init__() missing 1 required positional argument: 'cmd'

[aothms]

Maybe not to be merged as is, maybe some subprocesses, such as ifcopenshell.validate, return a non-zero statuscode if there are validation errors (probably 1) then. But any unknown exceptions should be handled. Maybe we should whitelist either 0 or 1, or make this expected statuscodes dependent on the program. But unhandled things somehow have to bubble up to us.