Add createdon/editedon timestamps to element and category tables#16930

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pbowyer wants to merge 3 commits intomodxcms:3.xfrom

pbowyer:peter/elements-createdon-editedon

Commits on Mar 21, 2026

Add createdon and editedon fields to element and association table schemas
pbowyer
committed
Set createdon on new elements/categories and add upgrade script
pbowyer
committed
Add tests for element and category timestamp behavior
pbowyer
committed