### 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
grid->add_child(script_option_edit);
	script_option_edit->connect("item_selected", callable_mp(this, &PluginConfigDialog::_on_language_changed));
	
	Label *script_lb = memnew(Label);
	script_lb->set_text(TTR("Script Name:"));
	script_lb->set_horizontal_alignment(HORIZONTAL_ALIGNMENT_RIGHT);
	grid->add_child(script_lb);
	script_validation = memnew(TextureRect);
	script_validation->set_v_size_flags(Control::SIZE_SHRINK_CENTER);
	grid->add_child(script_validation);
	script_edit = memnew(LineEdit);
	script_edit->connect("text_changed", callable_mp(this, &PluginConfigDialog::_on_required_text_changed));
	script_edit->set_placeholder("\"plugin.gd\" -> res://addons/my_plugin/plugin.gd");
	script_edit->set_h_size_flags(Control::SIZE_EXPAND_FILL);
	grid->add_child(script_edit);
	
	
	Label *active_lb = memnew(Label);
	active_lb->set_text(TTR("Activate now?"));
	active_lb->set_horizontal_alignment(HORIZONTAL_ALIGNMENT_RIGHT);
	grid->add_child(active_lb);
	Control *active_spacer = memnew(Control);
	grid->add_child(active_spacer);
	active_edit = memnew(CheckBox);
	active_edit->set_pressed(true);
	grid->add_child(active_edit);
}
PluginConfigDialog::~PluginConfigDialog() {
}