Fix a leak in a test and clarify some test names (#12781)

Fix a small leak of host memory in a java unit test. Also updates some tests that verify that a double free is safe, but don't make it clear from the logs that the double free is expected to be there. This is so we don't have to spend too much time debugging if this double free is expected or not.

Authors:
  - Robert (Bobby) Evans (https://github.com/revans2)

Approvers:
  - Kuhu Shukla (https://github.com/kuhushukla)
  - Jim Brennan (https://github.com/jbrennan333)
  - Jason Lowe (https://github.com/jlowe)
  - Raza Jafri (https://github.com/razajafri)
  - Gera Shegalov (https://github.com/gerashegalov)

URL: #12781

java/src/test/java/ai/rapids/cudf/ColumnVectorTest.java

@@ -1045,8 +1045,8 @@ void decimal128Cv() {
     BigInteger bigInteger2 = new BigInteger("14");
     BigInteger bigInteger3 = new BigInteger("152345742357340573405745");
     final BigInteger[] bigInts = new BigInteger[] {bigInteger1, bigInteger2, bigInteger3};
-    try (ColumnVector v = ColumnVector.decimalFromBigInt(-dec32Scale1, bigInts)) {
-      HostColumnVector hostColumnVector = v.copyToHost();
+    try (ColumnVector v = ColumnVector.decimalFromBigInt(-dec32Scale1, bigInts);
+         HostColumnVector hostColumnVector = v.copyToHost()) {
       assertEquals(bigInteger1, hostColumnVector.getBigDecimal(0).unscaledValue());
       assertEquals(bigInteger2, hostColumnVector.getBigDecimal(1).unscaledValue());
       assertEquals(bigInteger3, hostColumnVector.getBigDecimal(2).unscaledValue());

java/src/test/java/ai/rapids/cudf/ScalarTest.java

@@ -1,6 +1,6 @@
 /*
  *
- *  Copyright (c) 2019-2021, NVIDIA CORPORATION.
+ *  Copyright (c) 2019-2023, NVIDIA CORPORATION.
  *
  *  Licensed under the Apache License, Version 2.0 (the "License");
  *  you may not use this file except in compliance with the License.
@@ -41,7 +41,7 @@ public void testDoubleClose() {
   }
 
   @Test
-  public void testIncRef() {
+  public void testIncRefAndDoubleFree() {
     Scalar s = Scalar.fromNull(DType.INT32);
     try (Scalar ignored1 = s) {
       try (Scalar ignored2 = s.incRefCount()) {

java/src/test/java/ai/rapids/cudf/TableTest.java

@@ -244,7 +244,7 @@ void testOrderByWithNullsAndStrings() {
   }
 
   @Test
-  void testTableCreationIncreasesRefCount() {
+  void testTableCreationIncreasesRefCountWithDoubleFree() {
     //tests the Table increases the refcount on column vectors
     assertThrows(IllegalStateException.class, () -> {
       try (ColumnVector v1 = ColumnVector.build(DType.INT32, 5, Range.appendInts(5));