T194734: Implement edit conflict resolution for MCR

Phabricator Link	T194734
Status	open
Priority	normal (orange)
Author	[1]
Owner
Projects	Multi-Content-Revisions (New Features) CPT Initiatives (MCR)
Subtasks	T194736: Implement automatic conflict resolution for all slots &#91 MCR&#93
Parent Tasks	T174033: Refactor EditPage to allow multiple slots to be edited atomically [MCR]
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