### 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
ERR_FAIL_COND_V_MSG(valid_annotations.has(p_info.name), false, vformat(R"(Annotation "%s" already registered.)", p_info.name));
	AnnotationInfo new_annotation;
	new_annotation.info = p_info;
	new_annotation.info.default_arguments = p_default_arguments;
	if (p_is_vararg) {
		new_annotation.info.flags |= METHOD_FLAG_VARARG;
	}
	new_annotation.apply = p_apply;
	new_annotation.target_kind = p_target_kinds;
	valid_annotations[p_info.name] = new_annotation;
	return true;
}
GDScriptParser::SuiteNode *GDScriptParser::parse_suite(const String &p_context, SuiteNode *p_suite, bool p_for_lambda) {
	SuiteNode *suite = p_suite != nullptr ? p_suite : alloc_node<SuiteNode>();
	suite->parent_block = current_suite;
	suite->parent_function = current_function;
	current_suite = suite;
	bool multiline = false;
	if (match(GDScriptTokenizer::Token::NEWLINE)) {
		multiline = true;
	}
	if (multiline) {
		if (!consume(GDScriptTokenizer::Token::INDENT, vformat(R"(Expected indented block after %s.)", p_context))) {
			current_suite = suite->parent_block;
			complete_extents(suite);
			return suite;
		}