Feature/explorer executor groups #672

Job	Run time
javadoc-spotbugs-codeql	1m 47s
build-and-test-nflow-explorer	47s
build-and-test (17)	43s
build-and-test (21)	43s
integration-tests (17, h2)	4m 13s
build-and-test (22)	43s
integration-tests (17, mariadb)	4m 13s
integration-tests (17, postgresql)	4m 9s
integration-tests (17, mysql)	4m 14s
integration-tests (17, sqlserver)	4m 12s
integration-tests (17, db2)	4m 11s
integration-tests (17, oracle)	4m 12s
integration-tests (21, h2)	3m 52s
integration-tests (21, mariadb)	4m 11s
integration-tests (21, postgresql)	4m 11s
integration-tests (21, mysql)	4m 13s
integration-tests (21, sqlserver)	4m 12s
integration-tests (21, db2)	4m 11s
integration-tests (21, oracle)	4m 10s
	1h 3m 7s

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