chore: Refactor `CommitPubRand` #506

Job	Run time
lint_test / gosec	2m 45s
lint_test / check-mock-gen	0s
lint_test / build	56s
docker_pipeline / prepare-metadata	1s
lint_test / lint	41s
lint_test / integration-tests	26m 6s
lint_test / unit-tests	56s
docker_pipeline / docker_build (linux/amd64, ubuntu-24.04)	3m 7s
docker_pipeline / docker_build (linux/arm64, ubuntu-24.04-arm64)	3m 30s
docker_pipeline / merge_ecr	0s
docker_pipeline / merge_dockerhub	0s
	38m 2s

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