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Align DDL traversal and validation with active AST definitions #1316

Job	Run time
Grammar Choice Conflicts	25s
Gradle Check (macos-latest)	4m 40s
Gradle Check (ubuntu-latest)	4m 8s
Gradle Check (windows-latest)	5m 37s
Maven Verify (windows-latest)	5m 14s
Maven Verify (macos-latest)	5m 31s
Maven Verify (ubuntu-latest)	4m 33s
Gradle Publish (Maven Central)	0s
Build & Deploy Sphinx Docs	0s
	30m 8s