### Godot version

v4.0.beta14.official [28a24639c]

### System information

MacOS 12.6.2

### Issue description

Beta 14 throws an error for custom `@icon`, e.g.
```
class_name StateMachine extends Node

@icon("res://assets/icons/state_machine.svg")
```
> Annotation "`@icon`" is not allowed in this level.

In beta 13 and before that worked fine.

### Steps to reproduce

1. Add a custom `@icon` in a custom node script.
2. Error message: Annotation "`@icon`" is not allowed in this level.

There are possibly other errors because a `class_name` node is now not recognized if extended by other classes, but they should resolve if `@icon` is removed.

### Minimal reproduction project

N/A
head = alloc_node<ClassNode>();
	head->fqcn = script_path;
	current_class = head;
	bool can_have_class_or_extends = true;
	while (match(GDScriptTokenizer::Token::ANNOTATION)) {
		AnnotationNode *annotation = parse_annotation(AnnotationInfo::SCRIPT | AnnotationInfo::STANDALONE | AnnotationInfo::CLASS_LEVEL);
		if (annotation != nullptr) {
			if (annotation->applies_to(AnnotationInfo::SCRIPT)) {
				annotation->apply(this, head);
			} else {
				annotation_stack.push_back(annotation);
				
				
				
				can_have_class_or_extends = false;
				break;
			}