test: fix flaky IT testExecuteSelectWithCredentials (#3497)

Use priority instead of job timeout to force non-fast query in executeSelect.

Author: PhongChuong

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

@@ -109,6 +109,7 @@
 import com.google.cloud.bigquery.PolicyTags;
 import com.google.cloud.bigquery.PrimaryKey;
 import com.google.cloud.bigquery.QueryJobConfiguration;
+import com.google.cloud.bigquery.QueryJobConfiguration.Priority;
 import com.google.cloud.bigquery.QueryParameterValue;
 import com.google.cloud.bigquery.Range;
 import com.google.cloud.bigquery.RangePartitioning;
@@ -191,7 +192,6 @@
 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;
@@ -3251,7 +3251,6 @@ 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.
@@ -3272,7 +3271,7 @@ public void testExecuteSelectWithCredentials() throws SQLException {
 
  ConnectionSettings connectionSettings =
  ConnectionSettings.newBuilder()
- .setJobTimeoutMs(10L) // Force non-fast query to use BigQueryReadClient.
+ .setPriority(Priority.INTERACTIVE) // Force non-fast query to use BigQueryReadClient.
  .setDefaultDataset(DatasetId.of(DATASET))
  .build();
  Connection connectionGoodCredentials =