Create Plugin dialog's validation should be changed for consistency

[KoBeWi]

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:

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:

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

[brno32]

I'd be happy to take a look at this one

[eugene87222]

Hi @brno32, would you mind letting me fix this issue😄?
I've fixed it in my fork repo.

[brno32]

I do not mind! Your code looks similar to mine :)

Do we use the assignee feature here? I had already started working on it, so an official assignee might have saved the duplicated effort.

[eugene87222]

Thanks! I think assignee is not required here.