Make NotEntitledException inherit from AccessControlException for compatibility purposes (elastic#124321)

Even if the contract for JDK methods using the SecurityManager states that the exception throw is of type SecurityException, many libraries (including our own, apparently!) violates that and use the type actually thrown by SecurityManager, AccessControlException. A prime example is the GCS/CSP libraries.
In order to maintain compatibility for them, we need to inherit from the more specific AccessControlException; this is less desirable, as AccessControlException is marked as deprecated for removal alongside the other SecurityManager classes, but we discussed and found this is the best short term solution.

More work will be needed -- again, this is a short term solution.

Replaces elastic#123984

Author: ldematte

libs/entitlement/src/main/java/org/elasticsearch/entitlement/runtime/api/NotEntitledException.java

@@ -9,12 +9,10 @@
 
 package org.elasticsearch.entitlement.runtime.api;
 
-public class NotEntitledException extends SecurityException {
+import java.security.AccessControlException;
+
+public class NotEntitledException extends AccessControlException {
     public NotEntitledException(String message) {
         super(message);
     }
-
-    public NotEntitledException(String message, Throwable cause) {
-        super(message, cause);
-    }
 }

x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/ssl/SSLConfigurationReloader.java

@@ -12,15 +12,13 @@
 import org.elasticsearch.action.support.PlainActionFuture;
 import org.elasticsearch.common.ssl.SslConfiguration;
 import org.elasticsearch.core.TimeValue;
-import org.elasticsearch.entitlement.runtime.api.NotEntitledException;
 import org.elasticsearch.watcher.FileChangesListener;
 import org.elasticsearch.watcher.FileWatcher;
 import org.elasticsearch.watcher.ResourceWatcherService;
 import org.elasticsearch.watcher.ResourceWatcherService.Frequency;
 
 import java.io.IOException;
 import java.nio.file.Path;
-import java.security.AccessControlException;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.HashMap;
@@ -110,7 +108,7 @@ private static void startWatching(
             fileWatcher.addListener(changeListener);
             try {
                 resourceWatcherService.add(fileWatcher, Frequency.HIGH);
-            } catch (IOException | AccessControlException | NotEntitledException e) {
+            } catch (IOException | SecurityException e) {
                 logger.error("failed to start watching directory [{}] for ssl configurations [{}] - {}", path, configurations, e);
             }
         });