### Godot version

4.0 beta 10

### System information

Windows 10

### Issue description

Godot crashes when i accidently name 2 items in an enum the same

EDIT:
The editor freeze for some seconds, then both editor- and console-window dissapear

### Steps to reproduce

Write

```gdscript
enum {
    A,
}
```

and then add a second line with another A:

```gdscript
enum {
    A,
    A # <- crash
}
```

Does not always immediatly happen if i copy&paste items.
Does not happen when i change the script in another editor and open the script in Godot.

### Minimal reproduction project

[enum.zip](https://github.com/godotengine/godot/files/10313759/enum.zip)

GDScriptParser::DataType bad_type;
	bad_type.kind = GDScriptParser::DataType::VARIANT;
	bad_type.type_source = GDScriptParser::DataType::INFERRED;
	if (p_type == nullptr) {
		return bad_type;
	}
	if (p_type->get_datatype().is_resolving()) {
		push_error(R"(Could not resolve datatype: Cyclic reference.)", p_type);
		return bad_type;
	}
	if (!p_type->get_datatype().has_no_type()) {
		return p_type->get_datatype();
	}
	GDScriptParser::DataType resolving_datatype;
	resolving_datatype.kind = GDScriptParser::DataType::RESOLVING;
	p_type->set_datatype(resolving_datatype);
	GDScriptParser::DataType result;
	result.type_source = GDScriptParser::DataType::ANNOTATED_EXPLICIT;
	result.builtin_type = Variant::OBJECT;
	if (p_type->type_chain.is_empty()) {
		
		result.kind = GDScriptParser::DataType::BUILTIN;
		result.builtin_type = Variant::NIL;
		p_type->set_datatype(result);
		return result;
	}
	StringName first = p_type->type_chain[0]->name;
	if (first == SNAME("Variant")) {
		if (p_type->type_chain.size() > 1) {