[WIP] improve: read cache after write corner case for missed delete event #6515

Job	Run time
sample_operators_tests (sample-operators/metrics-processing)	2m 33s
sample_operators_tests (sample-operators/webpage)	2m 47s
sample_operators_tests (sample-operators/mysql-schema)	2m 49s
sample_operators_tests (sample-operators/leader-election)	2m 49s
sample_operators_tests (sample-operators/tomcat-operator)	2m 47s
	13m 45s

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