T194042: Replace usages of WikiPage::prepareContentForEdit

Phabricator Link	T194042
Status	open
Priority	normal (orange)
Author	[1]
Owner
Projects	Multi-Content-Revisions (Tech Debt) CPT Initiatives (MCR)
Subtasks	T194049: Introduce SlotRenderingProvider, T194048: Introduce RevisionRenderer (baseline)
Parent Tasks	T196087: Refactored implementation of MCR page update interface
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