refactor: Tool Output Management: Add Component-Specific Variable for Conditional Tool Output (#4259)

Implement conditional tool output handling

- Updated `component.py` to check for `FEATURE_FLAGS.add_toolkit_output` and call `_append_tool_output` if the component has the `add_tool_output` attribute set to True.
- Ensured that the tool output behavior is correctly managed based on feature flags and component attributes in `custom_component.py`.

src/backend/base/langflow/custom/custom_component/component.py

@@ -91,9 +91,9 @@ class Component(CustomComponent):
         self.__inputs = inputs
         self.__config = config
         self._reset_all_output_values()
-        if FEATURE_FLAGS.add_toolkit_output and hasattr(self, "_append_tool_output"):
-            self._append_tool_output()
         super().__init__(**config)
+        if (FEATURE_FLAGS.add_toolkit_output) and hasattr(self, "_append_tool_output") and self.add_tool_output:
+            self._append_tool_output()
         if hasattr(self, "_trace_type"):
             self.trace_type = self._trace_type
         if not hasattr(self, "trace_type"):

src/backend/base/langflow/custom/custom_component/custom_component.py

@@ -59,6 +59,8 @@ class CustomComponent(BaseComponent):
     is_input: bool | None = None
     """The input state of the component. Defaults to None.
     If True, the component must have a field named 'input_value'."""
+    add_tool_output: bool | None = False
+    """Indicates whether the component will be treated as a tool. Defaults to False."""
     is_output: bool | None = None
     """The output state of the component. Defaults to None.
     If True, the component must have a field named 'input_value'."""