[Test] [Linux] org.eclipse.core.tests.runtime.jobs.JobGroupTest.testShouldCancel_4 fails randomly

[fedejeanne]

Failed randomly on Linux for #1952 --> https://github.com/eclipse-platform/eclipse.platform/pull/1952/checks?check_run_id=44039316876

2.0
java.lang.AssertionError: 2.0
	at org.junit.Assert.fail(Assert.java:89)
	at org.junit.Assert.assertTrue(Assert.java:42)
	at org.eclipse.core.tests.runtime.jobs.JobGroupTest.testShouldCancel_4(JobGroupTest.java:1281)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1596)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1596)

I've only seen it fail on Linux but it might be that it fails on other OSes too. It remains to be seen.