Add a pipeline processing example when rollback on_failure with needs
What does this MR do and why?
From #388866
This MR adds a pipeline processing example showing that
the pipeline processing does not work as expected when using DAG with when: on_failure
.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Edited by Furkan Ayhan