Fix: Langfuse "parent run not found" error with agents using tools (#10268)

* fix: Use the same langchain callbacks for the agent and its tools so that the parent run is persisted during tool calls.

chore: build component index

refactor tool callback setting loop into a function

chore: update component index

recover block in base/agent.py

add comments and use fresh callbacks when exposing agent as a tool

improve comment in agent.py

* chore: update component index

* chore: update component index

* [autofix.ci] apply automated fixes

* [autofix.ci] apply automated fixes (attempt 2/3)

* [autofix.ci] apply automated fixes (attempt 3/3)

---------

Co-authored-by: Hamza Rashid <hzaras@IBM-JZ7K264.localdomain>
Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

Author: 3 people