[junitlauncher] Don't let the PipedInputStream.read()s continue when the main thread exits

Related to https://bz.apache.org/bugzilla/show_bug.cgi?id=64733

The main "writer" thread which initiates the writes to the PipedOutputStream (via the switched System.out/System.err) would exit/complete but would leave the SysOutErrStreamReader thread alive thus causing the PipedInputStream.read()s to continue happening in that SysOutErrStreamReader thread. This would cause the following IOException because the writer thread has exited and is no longer alive:

[junitlauncher] Caused by: java.io.IOException: Pipe broken
[junitlauncher] 	at java.base/java.io.PipedInputStream.read(PipedInputStream.java:321)
[junitlauncher] 	at java.base/java.io.PipedInputStream.read(PipedInputStream.java:377)
[junitlauncher] 	at java.base/java.io.InputStream.read(InputStream.java:205)
[junitlauncher] 	at org.apache.tools.ant.taskdefs.optional.junitlauncher.LauncherSupport$SysOutErrStreamReader.run(LauncherSupport.java:525)
[junitlauncher] 	... 1 more

src/main/org/apache/tools/ant/taskdefs/optional/junitlauncher/LauncherSupport.java

@@ -44,6 +44,7 @@ import org.junit.platform.launcher.core.LauncherFactory;
 import org.junit.platform.launcher.listeners.SummaryGeneratingListener;
 import org.junit.platform.launcher.listeners.TestExecutionSummary;
 
+import java.io.Closeable;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
@@ -153,6 +154,29 @@ public class LauncherSupport {
                         } catch (Exception e) {
                             // ignore
                         }
+                        // close the streams that we had used to redirect System.out/System.err
+                        try {
+                            firstListener.switchedSysOutHandle.ifPresent((h) -> {
+                                try {
+                                    h.close();
+                                } catch (Exception e) {
+                                    // ignore
+                                }
+                            });
+                        } catch (Exception e) {
+                            // ignore
+                        }
+                        try {
+                            firstListener.switchedSysErrHandle.ifPresent((h) -> {
+                                try {
+                                    h.close();
+                                } catch (Exception e) {
+                                    // ignore
+                                }
+                            });
+                        } catch (Exception e) {
+                            // ignore
+                        }
                     }
                     handleTestExecutionCompletion(test, firstListener.getSummary());
                 } finally {
@@ -600,7 +624,7 @@ public class LauncherSupport {
         }
     }
 
-    private final class SwitchedStreamHandle {
+    private final class SwitchedStreamHandle implements AutoCloseable {
         private final PipedOutputStream outputStream;
         private final SysOutErrStreamReader streamReader;
 
@@ -608,6 +632,12 @@ public class LauncherSupport {
             this.streamReader = streamReader;
             this.outputStream = outputStream;
         }
+
+        @Override
+        public void close() throws Exception {
+            outputStream.close();
+            streamReader.sourceStream.close();
+        }
     }
 
     private final class Listener extends SummaryGeneratingListener {