chore: add multiple attempts on bigtable sample (#8447)

Author: averikitsch

bigtable/hbase/snippets/src/test/java/com/example/bigtable/FiltersTest.java

@@ -21,6 +21,7 @@
 
 import com.google.cloud.bigtable.admin.v2.BigtableTableAdminClient;
 import com.google.cloud.bigtable.hbase.BigtableConfiguration;
+import com.google.cloud.testing.junit4.MultipleAttemptsRule;
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.PrintStream;
@@ -38,10 +39,13 @@
 import org.junit.AfterClass;
 import org.junit.Before;
 import org.junit.BeforeClass;
+import org.junit.Rule;
 import org.junit.Test;
 
 public class FiltersTest {
 
+  @Rule public final MultipleAttemptsRule multipleAttemptsRule = new MultipleAttemptsRule(5);
+
   private static final String INSTANCE_ENV = "BIGTABLE_TESTING_INSTANCE";
   private static final String TABLE_ID =
       "mobile-time-series-" + UUID.randomUUID().toString().substring(0, 20);