test(bigtable): fix mv tests (#2608)

Author: ron-gal

google-cloud-bigtable/src/test/java/com/google/cloud/bigtable/admin/v2/it/BigtableMaterializedViewIT.java

@@ -43,14 +43,12 @@
 import org.junit.Before;
 import org.junit.BeforeClass;
 import org.junit.ClassRule;
-import org.junit.Ignore;
 import org.junit.Rule;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.junit.runners.JUnit4;
 
 @RunWith(JUnit4.class)
-@Ignore("Skipping while debugging root cause for failures")
 public class BigtableMaterializedViewIT {
   @ClassRule public static final TestEnvRule testEnvRule = new TestEnvRule();
   @Rule public final PrefixGenerator prefixGenerator = new PrefixGenerator();
@@ -82,8 +80,7 @@ public static void createInstance() throws IOException {
             CreateInstanceRequest.of(new PrefixGenerator().newPrefix())
                 .addCluster("my-cluster", "us-east1-c", 3, StorageType.SSD));
     instanceId = instance.getId();
-    tableAdminClient =
-        BigtableTableAdminClient.create(testEnvRule.env().getProjectId(), instanceId);
+    tableAdminClient = testEnvRule.env().getTableAdminClientForInstance(instanceId);
   }
 
   @AfterClass