HBASE-28025 Enhance ByteBufferUtils.findCommonPrefix to compare 8 bytes each time [addendum] (#5362)

Remove the "@test" annotation from the "TestBytes" class due to
its reliance on "TestCase" from JUnit 3.

Signed-off-by: Duo Zhang <zhangduo@apache.org>

Author: petersomogyi

hbase-common/src/test/java/org/apache/hadoop/hbase/util/TestBytes.java

@@ -551,12 +551,10 @@ public void testToFromHex() {
     }
   }
 
-  @Test
   public void testFindCommonPrefix() throws Exception {
     testFindCommonPrefix(false);
   }
 
-  @Test
   public void testFindCommonPrefixUnsafe() throws Exception {
     testFindCommonPrefix(true);
   }