Remove deduplication logic in evaluation history

[dmjb]

I have run into a number of issues involving pq and sqlc's ability to deal with postgres timestamp arrays. At this point, rather than invest further effort, I have decided to remove the deduplication feature for now. Since this will only be useful at the point where we use reconciliation more extensively, I would prefer to reintroduce this functionality once we have more data to back up its utility.

Summary

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Fixes #(related issue)

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Review Checklist:

• Reviewed my own code for quality and clarity.
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[coveralls]

coverage: 52.73% (-0.04%) from 52.769%
when pulling 72851de on remove-dedupe-logic
into 3be7c67 on main.