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fix: validate select items and skipped clauses in SelectValidator #1478

Job	Run time
Grammar Choice Conflicts	41s
Gradle Check (windows-latest)	5m 31s
Gradle Check (ubuntu-latest)	4m 36s
Gradle Check (macos-latest)	4m 58s
Maven Verify (macos-latest)	5m 26s
Maven Verify (windows-latest)	6m 0s
Maven Verify (ubuntu-latest)	4m 54s
Build & Deploy Sphinx Docs	0s
Gradle Publish (Maven Central)	0s
	32m 6s