GetNextWorkRequestView: Don't disturb parent workflows

Colin Watsonrequested to merge
cjwatson/debusine:fix-worker-failed-retry-for-workflows into devel

If we find that we need to retry some running work requests when getting the next pending work request for a worker, do so in a way that doesn't cause parent workflows to be incorrectly marked as completed.

Fixes: #1081 (closed)

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