### 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)


GDScriptParser::DataType type;
	type.type_source = GDScriptParser::DataType::ANNOTATED_EXPLICIT;
	type.kind = GDScriptParser::DataType::BUILTIN;
	type.builtin_type = p_type;
	type.is_constant = true;
	type.is_meta_type = true;
	return type;
}
bool GDScriptAnalyzer::has_member_name_conflict_in_script_class(const StringName &p_member_name, const GDScriptParser::ClassNode *p_class, const GDScriptParser::Node *p_member) {
	if (p_class->members_indices.has(p_member_name)) {
		int index = p_class->members_indices[p_member_name];
		const GDScriptParser::ClassNode::Member *member = &p_class->members[index];
		if (member->type == GDScriptParser::ClassNode::Member::VARIABLE ||
				member->type == GDScriptParser::ClassNode::Member::CONSTANT ||
				member->type == GDScriptParser::ClassNode::Member::ENUM ||
				member->type == GDScriptParser::ClassNode::Member::ENUM_VALUE ||
				member->type == GDScriptParser::ClassNode::Member::CLASS ||
				member->type == GDScriptParser::ClassNode::Member::SIGNAL) {
			return true;
		}
		if (p_member->type != GDScriptParser::Node::FUNCTION && member->type == GDScriptParser::ClassNode::Member::FUNCTION) {
			return true;
		}
	}
	return false;
}
bool GDScriptAnalyzer::has_member_name_conflict_in_native_type(const StringName &p_member_name, const StringName &p_native_type_string) {