### Godot version

3fa8fad

### System information

Debian Linux x86

### Issue description

#79205 introduces a regression to the way rpc configs are inherited, causing this error:

```
ERROR: Unable to get the RPC configuration for the function "foo" at path: "/root/Node". This happens when the method is missing or not marked for RPCs in the local script.
```

even though the function exists both in the server and the client. If you `print(self.foo)`, it even tells you that it's rpc: `Node(client.gd)::foo (rpc)` 

Before #79205 `GdScriptCompiler::_populate_class_members` used `GDScriptCache::get_full_script` to access the base script. This causes the parent script to be compiled (if it is not compiled yet), which in turn initializes the `rpc_config` property with a copy of the base value in [gdscript.cpp::_init_rpc_methods_properties](https://github.com/godotengine/godot/blob/3fa8fad26b97a8af20e7996b7e17d8f23fc04b89/modules/gdscript/gdscript.cpp#L1398-L1412)

However, `GDScriptCache::get_shallow_script` does not compile and thus does not initialize the `rpc_config` of the base script, causing the rpc functions not being included in the rpc config.

### Steps to reproduce

Extend a gdscript with a `@rpc` function annotation and try to do a network call:

server.gd:
```gdscript
extends Node

func _ready():
	var peer := ENetMultiplayerPeer.new()
	peer.create_server(1337)
	multiplayer.multiplayer_peer = peer

@rpc("any_peer") func foo():
	print("Server")
```

parent.gd:
```gdscript
extends Node

@rpc func foo(): pass
```

client.gd:
```gdscript
extends "parent.gd"

func _ready():
	var peer := ENetMultiplayerPeer.new()
	peer.create_client("localhost", 1337)
	multiplayer.connected_to_server.connect(func (): self.foo.rpc_id(1))
	multiplayer.multiplayer_peer = peer
```


### Minimal reproduction project

[test.zip](https://github.com/godotengine/godot/files/12215814/test.zip)

} else if (!call->is_super && call->callee->type == GDScriptParser::Node::IDENTIFIER && Variant::has_utility_function(call->function_name)) {
				
				gen->write_call_utility(result, call->function_name, arguments);
			} else if (!call->is_super && call->callee->type == GDScriptParser::Node::IDENTIFIER && GDScriptUtilityFunctions::function_exists(call->function_name)) {
				
				gen->write_call_gdscript_utility(result, call->function_name, arguments);
			} else {
				
				const GDScriptParser::ExpressionNode *callee = call->callee;
				if (call->is_super) {
					
					gen->write_super_call(result, call->function_name, arguments);
				} else {
					if (callee->type == GDScriptParser::Node::IDENTIFIER) {
						
						if (ClassDB::has_method(codegen.script->native->get_name(), call->function_name)) {
							
							GDScriptCodeGenerator::Address self;
							self.mode = GDScriptCodeGenerator::Address::SELF;
							MethodBind *method = ClassDB::get_method(codegen.script->native->get_name(), call->function_name);
							if (_can_use_ptrcall(method, arguments)) {
								
								gen->write_call_ptrcall(result, self, method, arguments);
							} else {
								
								gen->write_call_method_bind(result, self, method, arguments);
							}
						} else if (codegen.is_static || (codegen.function_node && codegen.function_node->is_static) || call->function_name == "new") {
							GDScriptCodeGenerator::Address self;
							self.mode = GDScriptCodeGenerator::Address::CLASS;