[Merge] ~philroche/livecd-rootfs/+git/livecd-rootfs:bugfix/unminimize-no-lxd-installer-package-noble into livecd-rootfs:ubuntu/master

[Philip Roche]

Philip Roche has proposed merging ~philroche/livecd-rootfs/+git/livecd-rootfs:bugfix/unminimize-no-lxd-installer-package-noble into livecd-rootfs:ubuntu/master.

Commit message:
fix: Fix calls to `unminimize` if lxd-installer package not present (LP: #2049723)

The unminimize script will try to install the lxd snap using the shim script
`/usr/sbin/lxd` from the lxd-installer package.

Previously `unminimize` was using `snap`
to install `lxd` directly which was being diverted by diverting the `snap` command.

This is no longer the case so we can remove `/usr/sbin/lxd` from the lxd-installer package
if it exists and then redirect any calls to `/usr/sbin/lxd` to `/bin/true`

This is a cherry pick forward port from Jammy livecd-rootfs version 2.765.37.

(cherry picked from commit 8b83212372e0c1adb1dbdf7ead234f93c52a189e)


Requested reviews:
  Canonical Foundations Team (canonical-foundations)
Related bugs:
  Bug #2049723 in livecd-rootfs (Ubuntu): "ubuntu-server ftbfs in jammy with livecd-rootfs 2.765.34"
  https://bugs.launchpad.net/ubuntu/+source/livecd-rootfs/+bug/2049723

For more details, see:
https://code.launchpad.net/~philroche/livecd-rootfs/+git/livecd-rootfs/+merge/459200
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