[Merge] ~philroche/livecd-rootfs/+git/livecd-rootfs:bugfix/ubuntu-cpc-lp-2054103-grub-pc-debconf into livecd-rootfs:ubuntu/master

[Philip Roche]

Philip Roche has proposed merging ~philroche/livecd-rootfs/+git/livecd-rootfs:bugfix/ubuntu-cpc-lp-2054103-grub-pc-debconf into livecd-rootfs:ubuntu/master.

Commit message:
fix: Set the required debconf settings to allow for non interactive grub updates in cloud images (LP: #2054103)

As part of addressing LP: #2054103 [1] an update to grub-pc added a feature to be able to ensure that grub-pc
installation can happen noninteractively on cloud images.

This change is equivalent to running

```
debconf-set-selections grub-pc grub-efi/cloud_style_installation boolean true
debconf-set-selections grub-pc grub-pc/cloud_style_installation boolean true
```

These were introduced optionally to determine the install device using
`grub-probe` dynamically instead of having to fill the `grub-pc/install-devices`
debconf entry.

[1] https://bugs.launchpad.net/cloud-images/+bug/2054103



Requested reviews:
  Canonical Foundations Team (canonical-foundations)
Related bugs:
  Bug #2054103 in cloud-images: "grub-pc reinstallation throws a prompt asking the device it should install on for Noble"
  https://bugs.launchpad.net/cloud-images/+bug/2054103

For more details, see:
https://code.launchpad.net/~philroche/livecd-rootfs/+git/livecd-rootfs/+merge/461062
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