[FLINK-35552][runtime] ExecutionGraph shouldn't expose CheckpointStat… #741

Job	Run time
Pre-compile Checks / Basic QA	8m 22s
Default (Java 8) / Compile	36m 37s
Default (Java 8) / E2E (group 1)	2h 2m 30s
Default (Java 8) / Test packaging/licensing	32m 54s
Default (Java 8) / E2E (group 2)	3h 1m 27s
Default (Java 8) / Test (module: core)	37m 11s
Default (Java 8) / Test (module: python)	30m 28s
Default (Java 8) / Test (module: table)	36m 5s
Default (Java 8) / Test (module: connect)	20m 15s
Default (Java 8) / Test (module: tests)	50m 30s
Default (Java 8) / Test (module: misc)	45m 51s
	10h 2m 10s

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