Editor Path belongs in user settings, not workspace

### Godot version

4.1

### VS Code version

1.83

### Godot Tools VS Code extension version

1.3.1

### System information

Windows 11

### Problem statement

Spin off from #420 which seems to be fixed now. However, when you set the editor path by using the file picker, I feel it should save to user settings, or at least ask the user where to save. The workspace settings should be committed to version control, and if we're developing in a team, there's good odds each team member will have their Godot editor installed somewhere different. Even just on my own, I have Godot in different places on my desktop and laptop.

### Proposed solution

Save the editor path in user settings when it's input by the extension file picker.