Disable flaky test (#11017)

Motivation:

The testGlobalWriteThrottle is flaky and failed our build multiple times now. Lets disable it for now until we had time to investigate

Modifications:

Disable flaky test

Result:

Less failures during build

handler/src/test/java/io/netty/handler/traffic/FileRegionThrottleTest.java

@@ -37,6 +37,7 @@ import io.netty.util.internal.PlatformDependent;
 import org.junit.After;
 import org.junit.Before;
 import org.junit.BeforeClass;
+import org.junit.Ignore;
 import org.junit.Test;
 
 import java.io.File;
@@ -83,6 +84,7 @@ public class FileRegionThrottleTest {
         group.shutdownGracefully();
     }
 
+    @Ignore("This test is flaky, need more investigation")
     @Test
     public void testGlobalWriteThrottle() throws Exception {
         final CountDownLatch latch = new CountDownLatch(1);