### Godot version

4.1.beta3

### System information

Fedora Workstation 38 - Godot 4.1.beta3 - Vulkan (Forward+)

### Issue description

**This is an issue created by the production team, we're working on it**

Currently, it's impossible to call virtual functions within GDScript.

This currently returns an error:
```gdscript
# a.gd
extends Node

func _process(delta: float) -> void:
	pass
```

```gdscript
# main.gd
extends Node

var my_node: Node = preload("res://a.gd").new()

func _process(delta: float) -> void:
	my_node._process(delta)  # Cannot call virtual function "_process()" because it hasn't been defined.
```

### Steps to reproduce

1. Create a script (`a.gd`) based on `Node` that declares `_process()`;
2. Create a main node;
3. Attach a script to the main node;
4. Initialize a variable with a new `a.gd` instance;
5. Try to run `_process()` on that node;
6. Find out that it returns an error.

### Minimal reproduction project

[virtual_functions.zip (updated)](https://github.com/godotengine/godot/files/11823992/virtual_functions.zip)


push_error(R"*(Cannot use shorthand "get_node()" notation ("$") on a class that isn't a node.)*", p_get_node);
	}
	mark_lambda_use_self();
	p_get_node->set_datatype(result);
}
GDScriptParser::DataType GDScriptAnalyzer::make_global_class_meta_type(const StringName &p_class_name, const GDScriptParser::Node *p_source) {
	GDScriptParser::DataType type;
	String path = ScriptServer::get_global_class_path(p_class_name);
	String ext = path.get_extension();
	if (ext == GDScriptLanguage::get_singleton()->get_extension()) {
		Ref<GDScriptParserRef> ref = get_parser_for(path);
		if (ref.is_null()) {
			push_error(vformat(R"(Could not find script for class "%s".)", p_class_name), p_source);
			type.type_source = GDScriptParser::DataType::UNDETECTED;
			type.kind = GDScriptParser::DataType::VARIANT;
			return type;
		}
		Error err = ref->raise_status(GDScriptParserRef::INHERITANCE_SOLVED);
		if (err) {
			push_error(vformat(R"(Could not resolve class "%s", because of a parser error.)", p_class_name), p_source);
			type.type_source = GDScriptParser::DataType::UNDETECTED;
			type.kind = GDScriptParser::DataType::VARIANT;
			return type;
		}
		return ref->get_parser()->head->get_datatype();
	} else {
		return make_script_meta_type(ResourceLoader::load(path, "Script"));
	}
}
void GDScriptAnalyzer::reduce_identifier_from_base_set_class(GDScriptParser::IdentifierNode *p_identifier, GDScriptParser::DataType p_identifier_datatype) {