docs: Added retry to DetectIT sample test (#785)

* Added retry to DetectIT test

* docs: Added retry to DetectIT sample test

* 🦉 Updates from OwlBot

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

Author: kweinmeister

video/src/test/java/beta/video/DetectIT.java

@@ -18,6 +18,7 @@
 
 import static com.google.common.truth.Truth.assertThat;
 
+import com.google.cloud.testing.junit4.MultipleAttemptsRule;
 import com.google.cloud.videointelligence.v1p2beta1.ObjectTrackingAnnotation;
 import com.google.cloud.videointelligence.v1p2beta1.TextAnnotation;
 import com.google.cloud.videointelligence.v1p2beta1.VideoAnnotationResults;
@@ -29,6 +30,7 @@
 import org.junit.After;
 import org.junit.Assert;
 import org.junit.Before;
+import org.junit.Rule;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.junit.runners.JUnit4;
@@ -57,6 +59,8 @@ public class DetectIT {
   private PrintStream out;
   private PrintStream originalPrintStream;
 
+  @Rule public MultipleAttemptsRule multipleAttemptsRule = new MultipleAttemptsRule(3);
+
   @Before
   public void setUp() {
     bout = new ByteArrayOutputStream();