org.eclipse.cdt.tests.dsf.gdb.tests.nonstop.StepIntoSelectionNonStopTest fails on CI

[Torbjorn-Svensson]

Describe the bug
The test case org.eclipse.cdt.tests.dsf.gdb.tests.nonstop.StepIntoSelectionNonStopTest does no longer work on CI.

To Reproduce
Steps to reproduce the behavior:
Do a change in org.eclipse.cdt.dsf.ui plugin and try to run the tests on the CI.

Expected behavior
The test case should pass without error.

Additional context
In #885, it can be seen that the test fails with for example this output:

test timed out after 300000 milliseconds
org.junit.runners.model.TestTimedOutException: test timed out after 300000 milliseconds
	at java.base/java.lang.Object.wait0(Native Method)
	at java.base/java.lang.Object.wait(Object.java:366)
	at org.eclipse.cdt.tests.dsf.gdb.framework.ServiceEventWaitor.waitForEvent(ServiceEventWaitor.java:136)
	at org.eclipse.cdt.tests.dsf.gdb.tests.StepIntoSelectionTest.triggerStepIntoSelection(StepIntoSelectionTest.java:196)
	at org.eclipse.cdt.tests.dsf.gdb.tests.StepIntoSelectionTest.recursiveMethod(StepIntoSelectionTest.java:319)
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
	at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
	at org.junit.rules.TestWatcher$1.evaluate(TestWatcher.java:61)
	at org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:299)
	at org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:293)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317)
	at java.base/java.lang.Thread.run(Thread.java:1583)
862,506 "recursiveMethod[gdb]" requesting gdb. Launched gdb 9.2.
Uncaught exception in session executor thread: java.lang.AssertionError: Exception thrown by a IServiceEventListener.ServiceHandlerMethod method
	at org.eclipse.cdt.dsf.service.DsfSession.doDispatchEvent(DsfSession.java:550)
	at org.eclipse.cdt.dsf.service.DsfSession$3.run(DsfSession.java:408)
	at org.eclipse.cdt.dsf.concurrent.DefaultDsfExecutor$TracingWrapperRunnable.run(DefaultDsfExecutor.java:381)
	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:572)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317)
	at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:304)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
	at java.base/java.lang.Thread.run(Thread.java:1583)