### 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
GDScriptTokenizer::Token::Type invalid = previous.type;
	switch (invalid) {
		case GDScriptTokenizer::Token::QUESTION_MARK:
			push_error(R"(Unexpected "?" in source. If you want a ternary operator, use "truthy_value if true_condition else falsy_value".)");
			break;
		default:
			return nullptr; 
	}
	
	return p_previous_operand;
}
GDScriptParser::TypeNode *GDScriptParser::parse_type(bool p_allow_void) {
	TypeNode *type = alloc_node<TypeNode>();
	make_completion_context(p_allow_void ? COMPLETION_TYPE_NAME_OR_VOID : COMPLETION_TYPE_NAME, type);
	if (!match(GDScriptTokenizer::Token::IDENTIFIER)) {
		if (match(GDScriptTokenizer::Token::VOID)) {
			if (p_allow_void) {
				complete_extents(type);
				TypeNode *void_type = type;
				return void_type;
			} else {
				push_error(R"("void" is only allowed for a function return type.)");
			}
		}
		
		complete_extents(type);
		return nullptr;
	}
	IdentifierNode *type_element = parse_identifier();