### 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
if (argument->type != Node::LITERAL) {
					push_error(vformat(R"(Expected %s as argument %d of annotation "%s".)", Variant::get_type_name(parameter.type), i + 1, p_annotation->name));
					return false;
				}
				Variant value = static_cast<LiteralNode *>(argument)->value;
				if (!Variant::can_convert_strict(value.get_type(), parameter.type)) {
					push_error(vformat(R"(Expected %s as argument %d of annotation "%s".)", Variant::get_type_name(parameter.type), i + 1, p_annotation->name));
					return false;
				}
				Callable::CallError error;
				const Variant *args = &value;
				Variant r;
				Variant::construct(parameter.type, r, &(args), 1, error);
				p_annotation->resolved_arguments.push_back(r);
				if (error.error != Callable::CallError::CALL_OK) {
					push_error(vformat(R"(Expected %s as argument %d of annotation "%s".)", Variant::get_type_name(parameter.type), i + 1, p_annotation->name));
					p_annotation->resolved_arguments.remove_at(p_annotation->resolved_arguments.size() - 1);
					return false;
				}
				break;
			}
		}
	}
	return true;
}
bool GDScriptParser::tool_annotation(const AnnotationNode *p_annotation, Node *p_node) {
	this->_is_tool = true;
	return true;
}
bool GDScriptParser::icon_annotation(const AnnotationNode *p_annotation, Node *p_node) {