Fast query path not handling multiple query runs correctly

[stephaniewang526]

Below test case fails:

  @Test
  public void testFastQueryDuplicateRequestIds() throws InterruptedException {
    String query =
        "SELECT TimestampField, StringField, BooleanField FROM " + TABLE_ID_FASTQUERY.getTable();
    QueryJobConfiguration config =
        QueryJobConfiguration.newBuilder(query).setDefaultDataset(DatasetId.of(DATASET)).build();
    TableResult result = bigquery.query(config);
    assertEquals(QUERY_RESULT_SCHEMA, result.getSchema());
    assertEquals(2, result.getTotalRows());
    assertNull(result.getNextPage());
    assertNull(result.getNextPageToken());
    assertFalse(result.hasNextPage());

    config.toBuilder().setQuery(query).build();
    TableResult result2 = bigquery.query(config);
    assertEquals(QUERY_RESULT_SCHEMA, result2.getSchema());
    assertEquals(2, result2.getTotalRows());
    assertNull(result2.getNextPage());
    assertNull(result2.getNextPageToken());
    assertFalse(result2.hasNextPage());
  }