Bug 35094611 - [35094573->14.1.1.0.13-CE] Harden SafeSortedMap due to several upgrade issues (v14.1.1.0->ce-v14.1.1.0)

Remote remote.full on release/coherence-v14.1.1.0 success, changes 98680, job.9.20230223003105.16742
(auto-submit integ 98680 release/coherence-v14.1.1.0 -> coherence-ce/release/coherence-ce-v14.1.1.0 after successfully running remote remote.full)
Job ID: job.9.20230223013239.14484

[git-p4: depot-paths = "//dev/coherence-ce/release/coherence-ce-v14.1.1.0/": change = 98684]

Author: jfialli

prj/coherence-testing-support/src/main/java/com/tangosol/util/BaseMapTest.java

@@ -574,8 +574,14 @@ public static void testMisc(Map map)
         {
         if (!(map instanceof OldLiteMap || map instanceof OldCache))
             {
-            testSerializable(map);
-            testExternalizableLite(map);
+            // disabled serialization for SafeSortedMap that extends ConcurrentSkipMap.
+            // ConcurrentSkipMap has custom Java serialization relying on package only access methods.
+            // SafeSortedMap supports null entry key or value and ConcurrentSkipMap does not.
+            if (!(map instanceof SafeSortedMap))
+                {
+                testSerializable(map);
+                testExternalizableLite(map);
+                }
             testCloneable(map);
             }
         }