### Godot version

v4.0.beta13.official [caacade56]

### System information

Linux Ubuntu 20.04 with Unity desktop

### Issue description

When calling an undefined function in the shader editor with argument(s), such as `undefined_function(1)`, the error reads:

> Too many arguments for "undefined_function()" call. Expected at most 0 but received 1.

instead of the expected:

> No matching function found for: 'undefined_function'.

This is possibly a regression introduced in https://github.com/godotengine/godot/issues/18225, since the latter was focused on the arguments part.

To avoid such regression in the future, consider adding a unit test with this case (and, in fact, unit tests for the other signature errors too if there are not already).

### Steps to reproduce

1. Create a shader resource and open the shader editor
2. Enter `undefined_function(1);` in the fragment() definition

### Minimal reproduction project

N/A
expression.write[i].node = op;
				if (!_validate_operator(op, &op->return_cache, &op->return_array_size)) {
					String at;
					for (int j = 0; j < op->arguments.size(); j++) {
						if (j > 0) {
							at += ", ";
						}
						at += get_datatype_name(op->arguments[j]->get_datatype());
						if (!op->arguments[j]->is_indexed() && op->arguments[j]->get_array_size() > 0) {
							at += "[";
							at += itos(op->arguments[j]->get_array_size());
							at += "]";
						}
					}
					_set_error(vformat(RTR("Invalid arguments to unary operator '%s': %s."), get_operator_text(op->op), at));
					return nullptr;
				}
				expression.remove_at(i + 1);
			}
		} else if (is_ternary) {
			if (next_op < 1 || next_op >= (expression.size() - 1)) {
				_set_parsing_error();
				ERR_FAIL_V(nullptr);
			}
			if (next_op + 2 >= expression.size() || !expression[next_op + 2].is_op || expression[next_op + 2].op != OP_SELECT_ELSE) {
				_set_error(RTR("Missing matching ':' for select operator."));
				return nullptr;
			}
			OperatorNode *op = alloc_node<OperatorNode>();
			op->op = expression[next_op].op;