T183487: MCR schema migration stage 3: stop using legacy fields

Phabricator Link	T183487
Status	resolved
Priority	normal (orange)
Author	[1]
Owner
Projects	Wikidata (monitoring) Multi-Content-Revisions (Deployment) (Backlog) CPT Initiatives (MCR Schema Migration) Story Core Platform Team Workboards (User Stories) (Done!)
Subtasks	T198312: Set the WMF cluster to use the new MCR-only schema, T174047: Hide deprecated/unused fields on toolforge replica &#91 MCR&#93 , T183488: MCR schema migration stage 2: populate new fields
Parent Tasks	T183490: MCR schema migration stage 4: Migrate External Store URLs (wmf production)
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