### Godot version

4.1.dev (1becfea37c)

### System information

MacOS 13.3 M1 Pro

### Issue description

When you use batch rename you can ask him to rename to invalid node names. it won't raise any warning nor error it will just rename to a valid node names without informing you of the change. For comparison with simple renames this is shown as warning
<img width="452" alt="Capture d’écran 2023-05-02 à 21 49 47" src="https://user-images.githubusercontent.com/66184050/235771076-a2f09307-6c8d-4687-8d31-58234e8e2bf1.png">


### Steps to reproduce

1. create a root Node and two Node children
2. select the two children
3. Batch rename the `e` to `%`
4. See that childrens have been renamed to `Nod_` and `Nod_2` without warning 

### Minimal reproduction project

N/A
RenameDialog *self = (RenameDialog *)p_self;
	String source_file = String::utf8(p_file);
	
	if (self->has_errors || source_file.find("regex") < 0) {
		return;
	}
	String err_str;
	if (p_errorexp && p_errorexp[0]) {
		err_str = String::utf8(p_errorexp);
	} else {
		err_str = String::utf8(p_error);
	}
	self->has_errors = true;
	self->lbl_preview_title->set_text(TTR("Regular Expression Error:"));
	self->lbl_preview->add_theme_color_override("font_color", EditorNode::get_singleton()->get_gui_base()->get_theme_color(SNAME("error_color"), SNAME("Editor")));
	self->lbl_preview->set_text(vformat(TTR("At character %s"), err_str));
}
String RenameDialog::_regex(const String &pattern, const String &subject, const String &replacement) {
	RegEx regex(pattern);
	return regex.sub(subject, replacement, true);
}
String RenameDialog::_postprocess(const String &subject) {