Test: Watermark improvements

[chrmarti]

#15383

• Windows @mousetraps
• MacOS @isidorn
• Linux @joaomoreno

Complexity: 2

• Verify the watermark shows different sets of commands depending on whether the workbench opened on a folder or not
• Start Code with a new user data dir (code --help) to see if it shows a third set of commands for new users, repeat a few times with a new dir because it only shows for 50% of new users
  • Restart with the same user dir and verify the decision stays the same (if it is shown it stays for 24h when no folder is open)