testing: ignore testExecuteSelectWithCredentials (#3493)

* testing: ignore flaky test for the time being

Related: #3471

Author: shollyman

google-cloud-bigquery/src/test/java/com/google/cloud/bigquery/it/ITBigQueryTest.java

@@ -191,6 +191,7 @@
 import java.util.logging.Logger;
 import org.junit.AfterClass;
 import org.junit.BeforeClass;
+import org.junit.Ignore;
 import org.junit.Rule;
 import org.junit.Test;
 import org.junit.rules.Timeout;
@@ -3250,6 +3251,7 @@ public void testExecuteSelectDefaultConnectionSettings() throws SQLException {
   }
 
   @Test
+  @Ignore("https://github.com/googleapis/java-bigquery/issues/3471")
   public void testExecuteSelectWithCredentials() throws SQLException {
     // This test validate that executeSelect uses the same credential provided by the BigQuery
     // object used to create the Connection client.