improve: integration test for PerResourcePollingEventSource delete event propagation #6492

Job	Run time
check_format_and_unit_tests	1m 43s
build / Special integration tests (21)	2m 20s
build / Special integration tests (17)	2m 31s
build / Special integration tests (25)	2m 15s
build / httpclient-tests (vertx) / Integration tests (25, v1.35.2, vertx)	10m 54s
build / integration_tests (17, v1.33.9) / Integration tests (17, v1.33.9, vertx)	10m 53s
build / integration_tests (17, v1.35.2) / Integration tests (17, v1.35.2, vertx)	10m 54s
build / httpclient-tests (jdk) / Integration tests (25, v1.35.2, jdk)	10m 53s
build / integration_tests (21, v1.34.5) / Integration tests (21, v1.34.5, vertx)	10m 53s
build / integration_tests (25, v1.35.2) / Integration tests (25, v1.35.2, vertx)	10m 56s
build / integration_tests (17, v1.34.5) / Integration tests (17, v1.34.5, vertx)	10m 54s
build / httpclient-tests (jetty) / Integration tests (25, v1.35.2, jetty)	10m 53s
build / integration_tests (25, v1.34.5) / Integration tests (25, v1.34.5, vertx)	10m 54s
build / integration_tests (25, v1.33.9) / Integration tests (25, v1.33.9, vertx)	10m 54s
build / integration_tests (21, v1.35.2) / Integration tests (21, v1.35.2, vertx)	10m 54s
build / integration_tests (21, v1.33.9) / Integration tests (21, v1.33.9, vertx)	10m 54s
build / integration_tests (17, v1.32.13) / Integration tests (17, v1.32.13, vertx)	10m 52s
build / integration_tests (21, v1.32.13) / Integration tests (21, v1.32.13, vertx)	10m 54s
build / integration_tests (25, v1.32.13) / Integration tests (25, v1.32.13, vertx)	10m 54s
	2h 52m 15s

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