DW in non-interactive mode on the main wiki actually upgrades subwikis too

The expected behavior was the upgrade of the main wiki's flavor only, but all wikis are upgraded.

It seems the faulty code is in OutdatedExtensionsDistributionStep, more specifically in https://github.com/xwiki/xwiki-platform/blob/1e5413959bef9ff5841ae957ef1bbbe142cea846/xwiki-platform-core/xwiki-platform-extension/xwiki-platform-extension-distribution/src/main/java/org/xwiki/extension/distribution/internal/job/step/OutdatedExtensionsDistributionStep.java#L139-L144

The code does not filter the extensions that are in other namespaces.