Add some extra info when terminate fails in tests

On GitHub I see fails in resume[gdb] (org.eclipse.cdt.tests.dsf.gdb.tests.MIRunControlTest)

with this output:

```
Terminate failed
org.eclipse.debug.core.DebugException: Terminate failed
	at org.eclipse.debug.core.Launch.terminate(Launch.java:300)
	at org.eclipse.cdt.dsf.gdb.launching.GdbLaunch.terminate(GdbLaunch.java:313)
	at org.eclipse.cdt.tests.dsf.gdb.framework.BaseTestCase.doAfterTest(BaseTestCase.java:662)
	at org.eclipse.cdt.tests.dsf.gdb.tests.MIRunControlTest.doAfterTest(MIRunControlTest.java:133)
	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.RunAfters.invokeMethod(RunAfters.java:46)
	at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:33)
	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)
Contains: Terminate failed
Contains: Terminate failed
790,475 "resume[gdb]" requesting gdb. Launched gdb 15.0.50.20240403.
```

which is insufficient to diagnose what is happening.

Part of #816

dsf-gdb/org.eclipse.cdt.tests.dsf.gdb/src/org/eclipse/cdt/tests/dsf/gdb/framework/BaseTestCase.java

@@ -20,10 +20,13 @@
 import static org.junit.Assert.assertTrue;
 
 import java.io.BufferedReader;
+import java.io.ByteArrayOutputStream;
 import java.io.FileReader;
 import java.io.IOException;
 import java.io.InputStreamReader;
+import java.io.PrintStream;
 import java.io.Reader;
+import java.lang.reflect.Field;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.HashMap;
@@ -54,10 +57,12 @@
 import org.eclipse.cdt.tests.dsf.gdb.tests.ITestConstants;
 import org.eclipse.cdt.utils.spawner.ProcessFactory;
 import org.eclipse.core.runtime.CoreException;
+import org.eclipse.core.runtime.IStatus;
 import org.eclipse.core.runtime.NullProgressMonitor;
 import org.eclipse.core.runtime.Platform;
 import org.eclipse.core.runtime.preferences.IEclipsePreferences;
 import org.eclipse.core.runtime.preferences.InstanceScope;
+import org.eclipse.debug.core.DebugException;
 import org.eclipse.debug.core.DebugPlugin;
 import org.eclipse.debug.core.IBreakpointManager;
 import org.eclipse.debug.core.ILaunch;
@@ -66,6 +71,8 @@
 import org.eclipse.debug.core.ILaunchConfigurationWorkingCopy;
 import org.eclipse.debug.core.ILaunchManager;
 import org.eclipse.debug.core.model.IBreakpoint;
+import org.eclipse.debug.core.model.IProcess;
+import org.eclipse.debug.core.model.RuntimeProcess;
 import org.eclipse.debug.internal.core.IInternalDebugCoreConstants;
 import org.junit.After;
 import org.junit.AfterClass;
@@ -659,7 +666,74 @@ protected void assertLaunchTerminates(GdbLaunch launch, boolean terminate) throw
 	@After
 	public void doAfterTest() throws Exception {
 		if (fLaunch != null) {
-			fLaunch.terminate();
+			ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
+			PrintStream out = new PrintStream(byteArrayOutputStream, true, "UTF-8");
+			IProcess[] processes = fLaunch.getProcesses();
+
+			out.println("Processes: " + Arrays.toString(processes));
+			for (IProcess process : processes) {
+				out.println("Process: " + process);
+				if (process instanceof RuntimeProcess runtimeProcess) {
+					Field field = RuntimeProcess.class.getDeclaredField("fProcess");
+					field.trySetAccessible();
+					Process javaProcess = (Process) field.get(runtimeProcess);
+					out.println("javaProcess: " + javaProcess);
+					try {
+						List<ProcessHandle> descendants = javaProcess.descendants().collect(Collectors.toList());
+						out.println("descendants: " + descendants);
+					} catch (UnsupportedOperationException e) {
+						out.println("descendants unsupported");
+					}
+				} else {
+					out.println("Class: " + process.getClass());
+				}
+				if (process.isTerminated()) {
+					out.println("isTerminated: true");
+					out.println("exitValue: " + process.getExitValue());
+				} else {
+					out.println("isTerminated: false");
+				}
+			}
+			boolean failed = false;
+			for (IProcess process : processes) {
+				out.println("TERMINATING");
+				out.println("Process: " + process);
+
+				if (process instanceof RuntimeProcess runtimeProcess) {
+					Field field = RuntimeProcess.class.getDeclaredField("fProcess");
+					field.trySetAccessible();
+					Process javaProcess = (Process) field.get(runtimeProcess);
+					if (javaProcess == null) {
+						out.println("javaProcess: null");
+					} else {
+						javaProcess.destroy();
+						out.println("WAITING");
+						boolean waitFor = javaProcess.waitFor(1, TimeUnit.SECONDS);
+						out.println("waitFor: " + waitFor);
+						if (waitFor) {
+							out.println("exitValue: " + javaProcess.exitValue());
+						} else {
+							failed = true;
+						}
+					}
+				}
+			}
+			String info = byteArrayOutputStream.toString("UTF-8");
+			try {
+				fLaunch.terminate();
+				if (failed) {
+					throw new RuntimeException("Failed to terminate\ninfo:\n" + info);
+				}
+			} catch (DebugException e) {
+				IStatus status = e.getStatus();
+				if (status != null) {
+					String statusString = status.toString();
+					throw new RuntimeException("Received debug exception with: " + statusString + "\ninfo:\n" + info,
+							e);
+				} else {
+					throw new RuntimeException("Received debug with no status\ninfo:\n" + info, e);
+				}
+			}
 			assertLaunchTerminates();
 			fLaunch = null;
 		}