[Refactor] Remove unused completed_keys property from StepCounter. (#1854)

Author: skandermoalla

torchrl/envs/transforms/transforms.py

@@ -5068,21 +5068,6 @@ def truncated_keys(self):
         self._truncated_keys = truncated_keys
         return truncated_keys
 
-    @property
-    def completed_keys(self):
-        done_keys = self.__dict__.get("_done_keys", None)
-        if done_keys is None:
-            # make the default done keys
-            done_keys = []
-            for reset_key in self.parent._filtered_reset_keys:
-                if isinstance(reset_key, str):
-                    key = "done"
-                else:
-                    key = (*reset_key[:-1], "done")
-                done_keys.append(key)
-        self.__dict__["_done_keys"] = done_keys
-        return done_keys
-
     @property
     def done_keys(self):
         done_keys = self.__dict__.get("_done_keys", None)