Use eventsource for secondary resource by default #5631

Job	Run time
sample_operators_tests (sample-operators/leader-election)	3m 24s
sample_operators_tests (sample-operators/mysql-schema)	2m 59s
sample_operators_tests (sample-operators/webpage)	3m 9s
sample_operators_tests (sample-operators/tomcat-operator)	3m 16s
	12m 48s

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