fix: fix junit module name in AGENTS.md (#3232) #6612

Job	Run time
sample_operators_tests (sample-operators/leader-election)	3m 15s
sample_operators_tests (sample-operators/mysql-schema)	2m 38s
sample_operators_tests (sample-operators/metrics-processing)	17m 53s
sample_operators_tests (sample-operators/webpage)	3m 15s
sample_operators_tests (sample-operators/tomcat-operator)	2m 58s
	29m 59s

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