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Temporarily make subpages in occupied namespaces non-Flow again

Description

Temporarily make subpages in occupied namespaces non-Flow again

This will allow ContentHandler::getDefaultModelFor to do the right
thing for wikitext subpages last edited before $wgContentHandlerUseDB
was turned on.

This should go to production. Then, Kunal's script for T103388
should be run on all WMF wikis. Then, this can be reverted.

Bug: T103776
Change-Id: I7af2e61dbb4968977c0898d20de24f8ce5f59f12
(cherry picked from commit 1f99880d9e1be0937578f4b240010641a3b88820)