`HttpClientStreamTest.testUploadWithPendingReadConcurrentServerCloseClosesStream(Transport)[3] H2C` is flaky

[lorban]

Jetty version(s) 12.0.x

Description HttpClientStreamTest.testUploadWithPendingReadConcurrentServerCloseClosesStream(Transport)[3] H2C sometimes fails with:

org.opentest4j.AssertionFailedError: expected: <true> but was: <false>
	at org.junit.jupiter.api.AssertionFailureBuilder.build(AssertionFailureBuilder.java:151)
	at org.junit.jupiter.api.AssertionFailureBuilder.buildAndThrow(AssertionFailureBuilder.java:132)
	at org.junit.jupiter.api.AssertTrue.failNotTrue(AssertTrue.java:63)
	at org.junit.jupiter.api.AssertTrue.assertTrue(AssertTrue.java:36)
	at org.junit.jupiter.api.AssertTrue.assertTrue(AssertTrue.java:31)
	at org.junit.jupiter.api.Assertions.assertTrue(Assertions.java:183)
	at org.eclipse.jetty.test.client.transport.HttpClientStreamTest.testUploadWithPendingReadConcurrentServerCloseClosesStream(HttpClientStreamTest.java:1152)

See: https://jenkins.webtide.net/job/jetty.project/job/jetty-12.0.x/1982/testReport/junit/org.eclipse.jetty.test.client.transport/HttpClientStreamTest/Parallel_Stage___Build___Test___JDK22___testUploadWithPendingReadConcurrentServerCloseClosesStream_Transport__3__H2C/