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Revert "Optimize top-bound lineage search to use index-only scan"

Brian Williams requested to merge revert-f0b643eb into master

What does this MR do and why?

This reverts merge request !144835 (merged) because query timeouts began happening in production when the feature flag was enabled. I will no longer pursue this performance optimization.

See: #469565 (comment 1973855319)

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