feat(api): Implement EventManager error logging and add coverage (#29204)

- Ensure `EventManager._notify_layers` logs exceptions instead of silently swallowing them 
  so GraphEngine layer failures surface for debugging
- Introduce unit tests to assert the logger captures the runtime error when collecting events
- Enable the `S110` lint rule to catch `try-except-pass` patterns
- Add proper error logging for existing `try-except-pass` blocks.

api/services/app_service.py

@@ -211,7 +211,7 @@ class AppService:
                     # override tool parameters
                     tool["tool_parameters"] = masked_parameter
                 except Exception:
-                    pass
+                    logger.exception("Failed to mask agent tool parameters for tool %s", agent_tool_entity.tool_name)
 
             # override agent mode
             if model_config: