fix: add proto roundtrips for Spark tests and fix issues it surfaces #854

Job	Run time
Dry-run release	21s
Check editorconfig	3s
Lint commits for semantic-release	11s
Build Examples	1m 59s
Build and Test Java	5m 15s
Security validation	4s
cyclonedx-sbom	1m 42s
osv-scanner (core)	9s
osv-scanner (isthmus)	8s
osv-scanner (isthmus-cli)	12s
Build Isthmus Native Image (ubuntu-latest)	6m 17s
Build Isthmus Native Image (macOS-latest)	13m 9s
	29m 30s

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