### 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
{ nullptr,                                          nullptr,                                        PREC_NONE }, 
		
		{ nullptr,                                          nullptr,                                        PREC_NONE }, 
		{ &GDScriptParser::parse_identifier,             	nullptr,                                        PREC_NONE }, 
		{ &GDScriptParser::parse_literal,                	nullptr,                                        PREC_NONE }, 
		
		{ nullptr,                                          &GDScriptParser::parse_binary_operator,      	PREC_COMPARISON }, 
		{ nullptr,                                          &GDScriptParser::parse_binary_operator,      	PREC_COMPARISON }, 
		{ nullptr,                                          &GDScriptParser::parse_binary_operator,      	PREC_COMPARISON }, 
		{ nullptr,                                          &GDScriptParser::parse_binary_operator,      	PREC_COMPARISON }, 
		{ nullptr,                                          &GDScriptParser::parse_binary_operator,      	PREC_COMPARISON }, 
		{ nullptr,                                          &GDScriptParser::parse_binary_operator,      	PREC_COMPARISON }, 
		
		{ nullptr,                                          &GDScriptParser::parse_binary_operator,      	PREC_LOGIC_AND }, 
		{ nullptr,                                          &GDScriptParser::parse_binary_operator,      	PREC_LOGIC_OR }, 
		{ &GDScriptParser::parse_unary_operator,         	&GDScriptParser::parse_binary_not_in_operator,	PREC_CONTENT_TEST }, 
		{ nullptr,                                          &GDScriptParser::parse_binary_operator,			PREC_LOGIC_AND }, 
		{ nullptr,                                          &GDScriptParser::parse_binary_operator,			PREC_LOGIC_OR }, 
		{ &GDScriptParser::parse_unary_operator,			nullptr,                                        PREC_NONE }, 
		
		{ nullptr,                                          &GDScriptParser::parse_binary_operator,      	PREC_BIT_AND }, 
		{ nullptr,                                          &GDScriptParser::parse_binary_operator,      	PREC_BIT_OR }, 
		{ &GDScriptParser::parse_unary_operator,         	nullptr,                                        PREC_NONE }, 
		{ nullptr,                                          &GDScriptParser::parse_binary_operator,      	PREC_BIT_XOR }, 
		{ nullptr,                                          &GDScriptParser::parse_binary_operator,      	PREC_BIT_SHIFT }, 
		{ nullptr,                                          &GDScriptParser::parse_binary_operator,      	PREC_BIT_SHIFT }, 
		
		{ &GDScriptParser::parse_unary_operator,         	&GDScriptParser::parse_binary_operator,      	PREC_ADDITION_SUBTRACTION }, 
		{ &GDScriptParser::parse_unary_operator,         	&GDScriptParser::parse_binary_operator,      	PREC_ADDITION_SUBTRACTION },