Add type check for parallelism (n_jobs)

Co-authored-by: nicolasservel <nico.servel@gmail.com>

Author: samronsin

dataikuapi/dss/ml.py

@@ -577,6 +577,7 @@ def parallelism(self):
 
     @parallelism.setter
     def parallelism(self, n_jobs):
+        assert isinstance(n_jobs, int)
         self._raw_settings["nJobs"] = n_jobs