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Draft: Memoize #status_of_jobs in StatusCollection

Hordur Freyr Yngvason requested to merge memoize-status-of-jobs-in-status-collection into master

What does this MR do and why?

Status calculations for DAG dependencies in the pipeline processing code was not memoized. This could lead to significant recalculations (but no database queries), which could add up if many jobs share the same set of needs.

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Edited by Hordur Freyr Yngvason

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