build: Enable PhanPluginNeverReturnMethod and make pass added several @return never types to Wikibase code. Once we can require PHP 8.1 and have access to a language-level never return type, we should convert those return types; at that point, we can also remove this kind of code:

// @phan-suppress-next-line PhanPluginUnreachableCode Wanted to guarantee return never at the language level
throw new LogicException( 'ApiUsageException not thrown' );