mistral/releasenotes/notes/remove_unnecessary_workflow...

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fixes:
- |
Eliminated an unnecessary update of the workflow execution object
when processing "on_action_complete" operation. W/o this fix all
such transactions would have to compete for the workflow executions
table that causes lots of DB deadlocks (on MySQL) and transaction
retries. In some cases the number of retries even exceeds the limit
(currently hardcoded 50) and such tasks can be fixed only with the
integrity checker over time.