Small health check improvements #5848

Job	Run time
sample_operators_tests (sample-operators/mysql-schema)	3m 57s
sample_operators_tests (sample-operators/leader-election)	3m 27s
sample_operators_tests (sample-operators/webpage)	4m 1s
sample_operators_tests (sample-operators/tomcat-operator)	3m 2s
	14m 27s

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