When modifying node types, revalidate only affected content

Currently when any node type is modified, all the content in the repository is re-validated. This takes quite a while and is troublesome in case the repository has unrelated inconsistencies caused by relaxed type checking during upgrade (OAK-1518) or other cases (like cluster merge) where we allow type checking to be relaxed. Thus it would be better if only the content directly affected by the node type modification was revalidated during such a commit.