chore: GenAI SDK client - remove unused evals method

PiperOrigin-RevId: 832294300

Author: sararob

vertexai/_genai/evals.py

@@ -882,13 +882,6 @@ def _get_evaluation_item(
         self._api_client._verify_response(return_value)
         return return_value
 
-    def run(self) -> types.EvaluateInstancesResponse:
-        """Evaluates an instance of a model.
-
-        This should eventually call _evaluate_instances()
-        """
-        raise NotImplementedError()
-
     def evaluate_instances(
         self,
         *,