Fix benchmark configuration and isolated parser class loading #837

Job	Run time
Grammar Choice Conflicts	27s
Gradle Check (ubuntu-latest)	2m 15s
Gradle Check (macos-latest)	3m 32s
Gradle Check (windows-latest)	3m 10s
Maven Verify (windows-latest)	3m 36s
Maven Verify (ubuntu-latest)	2m 52s
Maven Verify (macos-latest)	3m 42s
Build & Deploy Sphinx Docs	-1s
Gradle Publish (Maven Central)	-1s
	19m 32s

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