CAM: Fix job assignment and model/stock initialization in ObjectOp

This PR fixes a bug introduced with PR #25800
It updates the ObjectOp class to correctly assign the job, model,
and stock properties from the parentJob object. Previously, only
PathUtils.addToJob was called, which did not set these attributes directly.

This change ensures that when creating a new operation, the job, model,
and stock fields are properly initialized from the parent job. This
fixes issues where operations did not inherit the correct job context,
leading to missing or incorrect references to the model and stock, and
potential errors in downstream processing.

(cherry picked from commit ab817f8dc5)

src/Mod/CAM/Path/Op/Base.py

@@ -336,7 +336,10 @@ class ObjectOp(object):
 
         if not hasattr(obj, "DoNotSetDefaultValues") or not obj.DoNotSetDefaultValues:
             if parentJob:
-                self.job = PathUtils.addToJob(obj, jobname=parentJob.Name)
+                self.job = parentJob
+                self.model = parentJob.Model.Group if parentJob.Model else []
+                self.stock = parentJob.Stock if hasattr(parentJob, "Stock") else None
+                PathUtils.addToJob(obj, jobname=parentJob.Name)
             job = self.setDefaultValues(obj)
             if job:
                 job.SetupSheet.Proxy.setOperationProperties(obj, name)