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ci: run integration tests in parallel forks #8111

Job	Run time
sample_operators_tests (sample-operators/operations)	9m 49s
sample_operators_tests (sample-operators/webpage)	3m 56s
sample_operators_tests (sample-operators/tomcat-operator)	4m 14s
sample_operators_tests (sample-operators/leader-election)	4m 44s
sample_operators_tests (sample-operators/kotlin-operator)	3m 30s
sample_operators_tests (sample-operators/mysql-schema)	4m 11s
	30m 24s