[backport to 2.6] Transform TypeTree::TreePath<...> to a container.
In 2.6 dune-typetree either provides static or dynamic tree paths during traversal. Here we require statically sized tree paths, which may be on the type Dune::TypeTree::TreePath<...>. Unfortunately this does not behave like a container. As a workaround we copy this to a Dune::TupleVector which provides the same static information by a container-like interface.
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