fix: time unit in PeriodicCleanerExpectationManager and integration test #5887

Job	Run time
check_format_and_unit_tests	1m 19s
build / Special integration tests (25)	2m 26s
build / Special integration tests (17)	2m 26s
build / Special integration tests (21)	2m 36s
build / httpclient-tests (jdk) / Integration tests (25, 1.32.0, jdk)	26m 33s
build / integration_tests (17, 1.31.8) / Integration tests (17, 1.31.8, vertx)	26m 13s
build / httpclient-tests (jetty) / Integration tests (25, 1.32.0, jetty)	26m 16s
build / integration_tests (17, 1.33.1) / Integration tests (17, 1.33.1, vertx)	26m 29s
build / integration_tests (25, 1.30.12) / Integration tests (25, 1.30.12, vertx)	25m 1s
build / integration_tests (25, 1.32.4) / Integration tests (25, 1.32.4, vertx)	26m 25s
build / integration_tests (21, 1.31.8) / Integration tests (21, 1.31.8, vertx)	26m 49s
build / integration_tests (21, 1.30.12) / Integration tests (21, 1.30.12, vertx)	25m 8s
build / integration_tests (17, 1.30.12) / Integration tests (17, 1.30.12, vertx)	24m 41s
build / integration_tests (25, 1.33.1) / Integration tests (25, 1.33.1, vertx)	26m 45s
build / integration_tests (21, 1.33.1) / Integration tests (21, 1.33.1, vertx)	26m 49s
build / integration_tests (21, 1.32.4) / Integration tests (21, 1.32.4, vertx)	26m 59s
build / integration_tests (17, 1.32.4) / Integration tests (17, 1.32.4, vertx)	26m 25s
build / httpclient-tests (vertx) / Integration tests (25, 1.32.0, vertx)	25m 32s
build / integration_tests (25, 1.31.8) / Integration tests (25, 1.31.8, vertx)	26m 13s
	6h 41m 5s

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