Use retry_lock with explicit transaction in CreateDownstreamPipelineService

Panos Kanellidisrequested to merge
pkanellidis/retry-lock-create-downstream-pipeline into master

What does this MR do and why?

Switch from retry_lock_with_transaction to retry_lock with an explicit subject.transaction block in the else path since it performs multiple DB operations.

References

Edited by Panos Kanellidis

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