Don't execute ManageWikiNameSpaceMigration job on wiki creation #600

Job	Run time
call-mediawiki-tests-workflow (master, 8.2, 82, true, false) / master \| PHP 8.2	21s
call-mediawiki-tests-workflow (REL1_39, 7.4, 74, true, false) / REL1_39 \| PHP 7.4	19s
call-mediawiki-tests-workflow (master, 7.4, 74, true, false) / master \| PHP 7.4	19s
notify-irc	11s
	1m 10s

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