Optimize CanCan abilities using declarative hash conditions (#4797)

Refactor block-based CanCan ability definitions for ScientificName, AlternateName, Planting, Activity, and Harvest into declarative hash conditions to eliminate per-record SQL queries and N+1 evaluation overhead.

Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>
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