UML24 — Fix 14977 vs. 14638

There is an inconsistency between 14977 and 14638 that results in inconsistent association end subsets due to incomplete copy-down from Kernel to InternalStructures.

The resolution is to introduce 2 new generalizations

The generalizations that need to be added are between InternalStructures::StructuredClassifier and Kernel::Classifier, and between InternalStructures::Connector and Kernel::Feature. This enables the ends of A_ownedConnector_structuredClassifier to subset all the things they need to, especially redefinitionContext/redefinableElement. This becomes obvious when you look at the draft figure 9.2. The root cause of this was an attempt to apply both 14638 and 14977 which led to the error.