Java 21 [#96932](https://github.com/elastic/elasticsearch/pull/96932) (`-Druntime.java=21`) breaks `java.util.List` lookups in Painless scripts.

```
invalid foreach loop: method [java.util.List, iterator/0] not found
member method [java.util.List, add/1] not found
member method [java.util.List, asCollection/0] not found
member method [java.util.List, asList/0] not found
member method [java.util.List, isEmpty/0] not found
member method [java.util.List, size/0] not found
member method [java.util.List, stream/0] not found
```

`:modules:lang-painless:test` (57 failures): https://gradle-enterprise.elastic.co/s/dkpi5pcitruwy
`:modules:lang-painless:yamlRestTest` (6 failures) https://gradle-enterprise.elastic.co/s/rsf3522r44ilc

```
java -version
openjdk version "21-ea" 2023-09-19
OpenJDK Runtime Environment (build 21-ea+27-2343)
OpenJDK 64-Bit Server VM (build 21-ea+27-2343, mixed mode, sharing)
```

Refs: https://github.com/elastic/elasticsearch/issues/96997
modules/lang-painless/src/main/java/org/elasticsearch/painless/lookup/PainlessLookup.java
if (targetPainlessClass != null) {
                T painlessObject = objectLookup.apply(targetPainlessClass);
                if (painlessObject != null) {
                    return painlessObject;
                }
            }
        }
        currentTargetClass = originalTargetClass;
        Set<Class<?>> resolvedInterfaces = new HashSet<>();
        while (currentTargetClass != null) {
            Deque<Class<?>> targetInterfaces = new ArrayDeque<>(Arrays.asList(currentTargetClass.getInterfaces()));
            Class<?> targetInterface;
            while ((targetInterface = targetInterfaces.pollFirst()) != null) {
                if (resolvedInterfaces.add(targetInterface)) {
                    PainlessClass targetPainlessClass = classesToPainlessClasses.get(targetInterface);
                    if (targetPainlessClass != null) {
                        T painlessObject = objectLookup.apply(targetPainlessClass);
                        if (painlessObject != null) {
                            return painlessObject;
                        }
                        targetInterfaces.addAll(Arrays.asList(targetInterface.getInterfaces()));
                    }
                }
            }
            currentTargetClass = currentTargetClass.getSuperclass();
        }
        return null;
    }
}