Pass 'wiki' along to NamespaceMigrationJob (#419) #595

Job	Run time
call-mediawiki-tests-workflow (master, 8.2, 82, true, false) / master \| PHP 8.2	5m 50s
call-mediawiki-tests-workflow (master, 7.4, 74, true, false) / master \| PHP 7.4	6m 40s
call-mediawiki-tests-workflow (REL1_39, 7.4, 74, true, false) / REL1_39 \| PHP 7.4	5m 0s
notify-irc	31s
	18m 1s

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