feat(system): replace our SecurityManager by a Java agent

Part-of: https://github.com/kestra-io/kestra-ee/pull/6153

worker/src/main/java/io/kestra/worker/WorkerSecurityService.java

@@ -9,12 +9,4 @@ public class WorkerSecurityService {
     public State.Type callInSecurityContext(AbstractWorkerCallable callable) {
         return callable.call();
     }
-
-    public boolean isInSecurityContext() {
-        throw new UnsupportedOperationException();
-    }
-
-    public AbstractWorkerCallable getCallable() {
-        throw new UnsupportedOperationException();
-    }
 }