Handle Ubuntu's package rename

[Skyedra]

Ubuntu is changing the name of two packages:

ubuntu-advantage-tools --> ubuntu-pro-client ubuntu-advantage-pro --> ubuntu-pro-image-auto-attach

As of 5/12/24:

• Focal 20.04 has renamed package
• Jammy 22.04 has not renamed package (yet)
• Mantic 23.10 has not renamed package (yet)
• Noble 24.04 has renamed package

This results in apt dist-upgrade on 20.04 wanting to install: ubuntu-advantage-tools ubuntu-pro-client ubuntu-pro-client-l10n

New fake package blocks the new package name and thus should prevent this.