test: add Kotlin verification smoke test #7597

Job	Run time
sample_operators_tests (sample-operators/leader-election)	1m 35s
sample_operators_tests (sample-operators/tomcat-operator)	1m 36s
sample_operators_tests (sample-operators/mysql-schema)	1m 45s
sample_operators_tests (sample-operators/webpage)	1m 31s
sample_operators_tests (sample-operators/operations)	1m 45s
	8m 12s

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