feat: expectation pattern support #5763

Job	Run time
sample_operators_tests (sample-operators/leader-election)	3m 40s
sample_operators_tests (sample-operators/tomcat-operator)	3m 2s
sample_operators_tests (sample-operators/webpage)	3m 14s
sample_operators_tests (sample-operators/mysql-schema)	2m 57s
	12m 53s

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