feat: expectation pattern support #5567

Job	Run time
sample_operators_tests (sample-operators/tomcat-operator)	2m 43s
sample_operators_tests (sample-operators/mysql-schema)	3m 13s
sample_operators_tests (sample-operators/webpage)	4m 1s
sample_operators_tests (sample-operators/leader-election)	3m 28s
	13m 25s

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