test: fix metrics integration test, remove the server latency since t…

…his field… (#1377)

* fix: fix integration test, remove the server latency since this field may not exist

* format code

google-cloud-bigtable/src/test/java/com/google/cloud/bigtable/data/v2/it/BuiltinMetricsIT.java

@@ -37,14 +37,11 @@
 import org.junit.AfterClass;
 import org.junit.BeforeClass;
 import org.junit.ClassRule;
-import org.junit.Ignore;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.junit.runners.JUnit4;
 
-// TODO: re-enable this test
 @RunWith(JUnit4.class)
-@Ignore
 public class BuiltinMetricsIT {
   @ClassRule public static TestEnvRule testEnvRule = new TestEnvRule();
   public static MetricServiceClient metricClient;
@@ -53,7 +50,6 @@ public class BuiltinMetricsIT {
     "operation_latencies",
     "retry_count",
     "attempt_latencies",
-    "server_latencies",
     "connectivity_error_count",
     "application_latencies"
   };