Distinguish "killed by orchestrator" and actual failures

[romain-intel]

Summary

When a task dies, it can kill all the other concurrently running task and the UI does not distinguish these two "deaths"

Motivation

With a wide foreach, if there is a single failure somewhere, it can be difficult to figure out which one it is because all the tasks are marked as failed. It may be nice to be able to distinguish "user failure" from "killed by orchestrator" type of failures so the user may more easily narrow down on the actual cause of the failure.