### Godot version

4.0

### System information

Windows 10 x64

### Issue description

We have an established way to inform about invalid input fields: using red/green/yellow labels at the bottom:
![](https://user-images.githubusercontent.com/2223172/235779087-7db4a899-dd41-40c7-8cb3-b295a42eec5e.png)
It's used in Create New Scene dialog, Add Metadata dialog, New Folder dialog, Create Script dialog and probably others.

Meantime the New Plugin dialog (accessible in Project Settings -> Plugins) looks like this:
![image](https://user-images.githubusercontent.com/2223172/235783588-ef5e560c-8620-4017-9b50-86f8477fe40e.png)
Instead of info labels, it uses info icons that show message on hover. This dialog was created before we had an established way of validating input, so it needs updating.

### Steps to reproduce

1. Project
2. Project Settings
3. Plugins
4. Create New Plugin
5. 👀

### Minimal reproduction project

N/A
#include "plugin_config_dialog.h"
#include "core/io/config_file.h"
#include "core/io/dir_access.h"
#include "editor/editor_node.h"
#include "editor/editor_plugin.h"
#include "editor/editor_scale.h"
#include "editor/project_settings_editor.h"
#include "scene/gui/grid_container.h"
void PluginConfigDialog::_clear_fields() {
	name_edit->set_text("");
	subfolder_edit->set_text("");
	desc_edit->set_text("");
	author_edit->set_text("");
	version_edit->set_text("");
	script_edit->set_text("");
}
void PluginConfigDialog::_on_confirmed() {