Ignore performance-sensitive tests by default

Make use of the new JUnit functionality introduced in the previous
commit to 'Assume' that perfomance- and timing-sensitive tests should
run only when TestGroup.PERFORMANCE is selected, i.e. when
-PtestGroups="performance" has been provided at the Gradle command line.

The net effect is that these tests are now ignored by default, which
will result in far fewer false-negative CI build failures due to
resource contention and other external factors that cause slowdowns.

We will set up a dedicated performance CI build to run these tests on
an isolated machine, etc.

Issue: SPR-9984

src/test/java/org/springframework/scheduling/annotation/ScheduledAndTransactionalAnnotationIntegrationTests.java

@@ -18,10 +18,13 @@ package org.springframework.scheduling.annotation;
 
 import java.util.concurrent.atomic.AtomicInteger;
 
+import org.junit.Before;
 import org.junit.Test;
 
 import org.springframework.aop.support.AopUtils;
 import org.springframework.beans.factory.BeanCreationException;
+import org.springframework.build.junit.Assume;
+import org.springframework.build.junit.TestGroup;
 import org.springframework.context.annotation.AnnotationConfigApplicationContext;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
@@ -48,6 +51,11 @@ import static org.junit.Assert.*;
  */
 public class ScheduledAndTransactionalAnnotationIntegrationTests {
 
+	@Before
+	public void setUp() {
+		Assume.group(TestGroup.PERFORMANCE);
+	}
+
 	@Test
 	public void failsWhenJdkProxyAndScheduledMethodNotPresentOnInterface() {
 		AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();