T205353: Clean up empty ar_user_text and rev_user_text fields

Phabricator Link	T205353
Status	open
Priority	needs triage (violet)
Author	[1]
Owner
Projects	CPT Initiatives (Revision Storage Schema Improvements) MediaWiki-Revision-backend (Revision store) Wikimedia-database-error (Bad data & Corruption)
Subtasks
Parent Tasks	T167246: Refactor "user" & "user_text" fields into "actor" reference table
Tags

Property "Author" has a restricted application area and cannot be used as annotation property by a user.