[MNG-8295] Dependency Manager Transitivity (now default) handles dependency management inconsistently

[DidierLoiseau]

Actually use TransitiveDependencyManager when maven.resolver.dependencyManagerTransitivity=true, instead of ClassicDependencyManager(true, …) as per #1357.

This fixes MNG-8295 and the integration tests proposed in apache/maven-integration-testing#379.

I thought that, since the change is trivial, it doesn’t cost much to create a PR for it already – even if the consensus turns out to be something else in the end.

• Jira issue: MNG-8295
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[gnodet]

Superseded by #1788

[jira-importer]

Resolve #9962