CancelSignalTest fails from time to time

[DavideD]

I suspect this is a problem with the way the test works (not really an issue in Hibernate Reactive).
But, from time to time the test fails by throwing a TimeOutException.

I think we need to review it and see if we can fix the issues.

Error from CI:

Gradle Test Executor 2 > CancelSignalTest > cleanupConnectionWhenCancelSignal(VertxTestContext) FAILED
    java.util.concurrent.TimeoutException: The test execution timed out. Make sure your asynchronous code includes calls to either VertxTestContext#completeNow(), VertxTestContext#failNow() or Checkpoint#flag()

    Unsatisfied checkpoints diagnostics:
        at io.vertx.junit5.VertxExtension.joinActiveTestContexts(VertxExtension.java:216)
        at io.vertx.junit5.VertxExtension.interceptTestMethod(VertxExtension.java:143)
        at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)
        at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)