[FLINK-34986][Runtime/State] More tests for reference counting of Con… #55

Job	Run time
Default (Java 8) / Compile	44m 59s
Pre-compile Checks / Basic QA	9m 26s
Default (Java 8) / Test packaging/licensing	35m 26s
Default (Java 8) / Test (module: core)	35m 48s
Default (Java 8) / E2E (group 1)	1h 42m 29s
Default (Java 8) / Test (module: python)	31m 11s
Default (Java 8) / E2E (group 2)	2h 2m 35s
Default (Java 8) / Test (module: table)	38m 46s
Default (Java 8) / Test (module: connect)	18m 25s
Default (Java 8) / Test (module: tests)	47m 52s
Default (Java 8) / Test (module: misc)	44m 49s
	8h 51m 46s

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