Skip LogRotatorTest#ableToDeleteCurrentBuild on Windows (#9923)

* Skip `LogRotatorTest#ableToDeleteCurrentBuild` on Windows

* Also remove BuildWatcher from LogRotatorTest in case it was contributing to flakiness

test/src/test/java/hudson/tasks/LogRotatorTest.java

@@ -31,7 +31,9 @@
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertNull;
 import static org.junit.Assert.assertTrue;
+import static org.junit.Assume.assumeFalse;
 
+import hudson.Functions;
 import hudson.Launcher;
 import hudson.model.AbstractBuild;
 import hudson.model.BuildListener;
@@ -50,10 +52,8 @@
 import java.util.concurrent.TimeoutException;
 import java.util.logging.Level;
 import java.util.logging.Logger;
-import org.junit.ClassRule;
 import org.junit.Rule;
 import org.junit.Test;
-import org.jvnet.hudson.test.BuildWatcher;
 import org.jvnet.hudson.test.FailureBuilder;
 import org.jvnet.hudson.test.Issue;
 import org.jvnet.hudson.test.JenkinsRule;
@@ -64,9 +64,6 @@
  */
 public class LogRotatorTest {
 
-    @ClassRule
-    public static BuildWatcher watcher = new BuildWatcher();
-
     @Rule
     public JenkinsRule j = new JenkinsRule();
 
@@ -103,6 +100,8 @@ public void successVsFailureWithRemoveLastBuild() throws Exception {
 
     @Test
     public void ableToDeleteCurrentBuild() throws Exception {
+        assumeFalse("Deleting the current build while is is completing does not work consistently on Windows",
+                Functions.isWindows());
         var p = j.createFreeStyleProject();
         // Keep 0 builds, i.e. immediately delete builds as they complete.
         LogRotator logRotator = new LogRotator(-1, 0, -1, -1);