Fix Java 2 Security issue: Remove listener app from SessionCachePrefixTest

The session.cache.web.listener1 app was causing SRVE8059E NPE failures
under Java 2 Security when the server stopped. The listener app couldn't
properly access the session context during shutdown, causing:
- NullPointerException in session context
- Zombie server processes between test repeats
- Cascade failures in subsequent tests

Fix: Remove the listener app parameter from SessionCacheApp initialization.
The main session.cache.web app is sufficient for testing the cacheNamePrefix
feature.

Fixes: RTC 310836
Related: PR #35183 (revert), PR #34655 (original)

Author: riyaaroraa

dev/com.ibm.ws.session.cache_fat/fat/src/com/ibm/ws/session/cache/fat/SessionCachePrefixTest.java

@@ -56,7 +56,7 @@ public class SessionCachePrefixTest extends FATServletClient {
 
     @BeforeClass
     public static void setUp() throws Exception {
-        app = new SessionCacheApp(server, true, "session.cache.web", "session.cache.web.listener1");
+        app = new SessionCacheApp(server, true, "session.cache.web");
 
         String hazelcastConfigFile = "hazelcast-localhost-only-multicastDisabled.xml";
         String configLocation = new File(server.getUserDir() + "/shared/resources/hazelcast/" + hazelcastConfigFile).getAbsolutePath();