improve: PrimaryToSecondayMapper test improvements (#2951) #5604

Job	Run time
sample_operators_tests (sample-operators/mysql-schema)	2m 40s
sample_operators_tests (sample-operators/tomcat-operator)	2m 49s
sample_operators_tests (sample-operators/webpage)	4m 53s
sample_operators_tests (sample-operators/leader-election)	4m 13s
	14m 35s

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