Removes compat property Request.task_name (now .name)

celery/worker/request.py

@@ -425,15 +425,6 @@ class Request:
         return (not self.task.ignore_result or
                 self.task.store_errors_even_if_ignored)
 
-    @property
-    def task_name(self):
-        # XXX compat
-        return self.name
-
-    @task_name.setter  # noqa
-    def task_name(self, value):
-        self.name = value
-
     @property
     def reply_to(self):
         # used by rpc backend when failures reported by parent process