Fix affinity test flake due to missing column memoization #2816
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Charlie and I spent some time on this after noticing pretty frequent failure locally — guess it was just a coincidence that it worked in recent PRs and main commits. We were not memoizing the columns of the affinity groups table on the instance settings tab, so any render (caused, e.g., by instance state polling) would reset an open row actions menu. Related to #2618 and #1091.