T174033: Refactor EditPage to allow multiple slots to be edited atomically [MCR]

Phabricator Link	T174033
Status	open
Priority	needs triage (violet)
Author	[1]
Owner
Projects	Multi-Content-Revisions (New Features) Technical-Debt (Unsorted) CPT Initiatives (MCR)
Subtasks	T194734: Implement edit conflict resolution for MCR, T209927: Decide how to control which slots are offered for editing per default
Parent Tasks	T174022: Implement multi-content revisions T200570: Make ApiEditPage and ApiStashEdit API modules aware of MCR
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