apacheGH-41648: [Java] Memory Leak about splitAndTransfer (apache#41898)

### Rationale for this change

An inconsistency in the validity buffer split and transfer functionality in the `BaseFixedWidthVector`. 

### What changes are included in this PR?

- [X] Change to handle the validity buffer transfer
- [X] User provided test criterion which reproduced the error
- [X] Upgrading to JUnit 5

### Are these changes tested?

Mainly by existing test cases and added new one. 

### Are there any user-facing changes?

No
* GitHub Issue: apache#41648

Authored-by: Vibhatha Abeykoon <[email protected]>
Signed-off-by: David Li <[email protected]>

java/vector/src/main/java/org/apache/arrow/vector/BaseFixedWidthVector.java

@@ -674,8 +674,8 @@ private void splitAndTransferValidityBuffer(int startIndex, int length,
         if (target.validityBuffer != null) {
           target.validityBuffer.getReferenceManager().release();
         }
-        target.validityBuffer = validityBuffer.slice(firstByteSource, byteSizeTarget);
-        target.validityBuffer.getReferenceManager().retain(1);
+        ArrowBuf slicedValidityBuffer = validityBuffer.slice(firstByteSource, byteSizeTarget);
+        target.validityBuffer = transferBuffer(slicedValidityBuffer, target.allocator);
         target.refreshValueCapacity();
       } else {
         /* Copy data