Feature/explorer executor groups #663

Job	Run time
build-and-test (17)	43s
build-and-test-nflow-explorer	47s
integration-tests (17, h2)	3m 51s
javadoc-spotbugs-codeql	2m 4s
build-and-test (21)	42s
integration-tests (17, mariadb)	4m 11s
build-and-test (22)	48s
integration-tests (17, postgresql)	4m 8s
integration-tests (17, mysql)	4m 10s
integration-tests (17, sqlserver)	4m 8s
integration-tests (17, db2)	4m 9s
integration-tests (17, oracle)	4m 9s
integration-tests (21, h2)	3m 50s
integration-tests (21, mariadb)	4m 8s
integration-tests (21, postgresql)	4m 10s
integration-tests (21, mysql)	4m 11s
integration-tests (21, sqlserver)	4m 9s
integration-tests (21, db2)	4m 9s
integration-tests (21, oracle)	4m 8s
	1h 2m 35s

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