### 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)


case GDScriptParser::Node::ASSIGNMENT:
		case GDScriptParser::Node::AWAIT:
		case GDScriptParser::Node::BINARY_OPERATOR:
		case GDScriptParser::Node::CALL:
		case GDScriptParser::Node::CAST:
		case GDScriptParser::Node::DICTIONARY:
		case GDScriptParser::Node::GET_NODE:
		case GDScriptParser::Node::IDENTIFIER:
		case GDScriptParser::Node::LAMBDA:
		case GDScriptParser::Node::LITERAL:
		case GDScriptParser::Node::PRELOAD:
		case GDScriptParser::Node::SELF:
		case GDScriptParser::Node::SUBSCRIPT:
		case GDScriptParser::Node::TERNARY_OPERATOR:
		case GDScriptParser::Node::TYPE_TEST:
		case GDScriptParser::Node::UNARY_OPERATOR:
			reduce_expression(static_cast<GDScriptParser::ExpressionNode *>(p_node), p_is_root);
			break;
		case GDScriptParser::Node::BREAK:
		case GDScriptParser::Node::BREAKPOINT:
		case GDScriptParser::Node::CONTINUE:
		case GDScriptParser::Node::ENUM:
		case GDScriptParser::Node::FUNCTION:
		case GDScriptParser::Node::PASS:
		case GDScriptParser::Node::SIGNAL:
			
			break;
	}
}
void GDScriptAnalyzer::resolve_annotation(GDScriptParser::AnnotationNode *p_annotation) {