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OAuth: Don't authenticate accounts which are blocked in MediaWiki

Description

OAuth: Don't authenticate accounts which are blocked in MediaWiki

Summary:
This will prevent new account registration as well as preventing
logins for blocked mediawiki.org accounts. Refs T162996

Test Plan: untested

Reviewers: Aklapper, dpatrick, Reedy

Maniphest Tasks: T162996

Differential Revision: https://phabricator.wikimedia.org/D687