implement calculating task duration based on resource usage change for fixed person-hours and prevent constrained attributes from updating

src/ifcopenshell-python/ifcopenshell/api/resource/calculate_resource_work.py

@@ -60,6 +60,9 @@ class Usecase:
         self.settings = {"resource": resource}
 
     def execute(self):
+        metrics= ifcopenshell.util.constraint.has_metric_constraints(self.settings["resource"], "Usage.ScheduleWork")
+        if metrics and metrics[0].ConstraintGrade == "HARD" and metrics[0].Benchmark == "EQUALTO":
+            return
         amount_worked = ifcopenshell.util.resource.get_resource_required_work(
             self.settings["resource"]
         )