T189808: Make action=undo work with multiple slots.

Phabricator Link	T189808
Status	open
Priority	low (yellow)
Author	[1]
Owner
Projects	Multi-Content-Revisions (New Features) Wikidata (monitoring) CPT Initiatives (MCR) Structured Data Engineering (Monitoring) Structured-Data-Backlog (Tracking)
Subtasks	T194412: Make undo fail gracefully for non-main slots., T200216: Make undo work with SDC by showing a UI to confirm undo without allowing an edit
Parent Tasks	T174022: Implement multi-content revisions
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