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Split $wgCentralAuthAutoMigrate into two settings

Authored by Legoktm.

Description

Split $wgCentralAuthAutoMigrate into two settings

One for merging unattached accounts to an existing global one,
which was the original usage, and create
$wgCentralAuthAutoMigrateNonGlobalAccounts for globalizing unattached
accounts.

The latter currently causes OOMs (T78727) in certain conditions on
the Wikimedia cluster, but it would still be a good idea to keep
the former enabled.

Change-Id: I3b2f6dcf9ef69a6cf49fce953ce67844c74b2ab4

Details