Fix linter issues, remove temporary logging

Author: AnatoliB

azure/durable_functions/openai_agents/model_invocation_activity.py

@@ -165,14 +165,14 @@ def to_json(self) -> str:
         """Convert the ActivityModelInput to a JSON string."""
         try:
             return self.model_dump_json(warnings=False)
-        except Exception as e:
-            # logger.warning(f"Failed to serialize ActivityModelInput with warnings='none': {e}")
+        except Exception:
             # Fallback to basic JSON serialization
             try:
                 return json.dumps(self.model_dump(warnings=False), default=str)
             except Exception as fallback_error:
-                logger.error(f"Failed to serialize ActivityModelInput with fallback method: {fallback_error}")
-                raise ValueError(f"Unable to serialize ActivityModelInput: {fallback_error}") from fallback_error
+                raise ValueError(
+                    f"Unable to serialize ActivityModelInput: {fallback_error}"
+                ) from fallback_error
 
     @classmethod
     def from_json(cls, json_str: str) -> 'ActivityModelInput':