Show what specific type of refactorings/codeActions are not available when requesting explicit ones

[mjbvz]

Repo

1. Create a keybinding for extract constant:

	{
		"key": "ctrl+shift+e",
		"command": "editor.action.codeAction",
		"args": {
			"kind": "refactor.extract.constant",
			"preferred": true
		}
	}

2. Open a js file
3. Select something that cannot be extracted and use keyboard shortcut

Feature Request
Show error message specifically saying that no refactor.extract.constant refactorings are available

Today we just show a generic message that no refactorings are available