Share parser execution and preserve cancellation signals #834

Job	Run time
Gradle Check (macos-latest)	2m 40s
Gradle Check (ubuntu-latest)	2m 23s
Grammar Choice Conflicts	33s
Gradle Check (windows-latest)	4m 6s
Maven Verify (ubuntu-latest)	2m 18s
Maven Verify (windows-latest)	4m 10s
Maven Verify (macos-latest)	3m 53s
Build & Deploy Sphinx Docs	0s
Gradle Publish (Maven Central)	0s
	20m 3s

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