[Merge] ~philroche/livecd-rootfs/+git/livecd-rootfs:bugfix/lp-2061121-snap-preseed-latest into livecd-rootfs:ubuntu/mantic

[Philip Roche]

Philip Roche has proposed merging ~philroche/livecd-rootfs/+git/livecd-rootfs:bugfix/lp-2061121-snap-preseed-latest into livecd-rootfs:ubuntu/mantic.

Commit message:
fix: Use Ubuntu policy default channel "latest" for preseeded snaps (LP: #2061121)

Recent Mantic cloud image builds fail after default track for LXD change to "5.21" instead of "latest"

Theis change preseed from "latest/" for all snaps and no longer assume that "latest/" is the default.



Requested reviews:
  Canonical Foundations Team (canonical-foundations)
Related bugs:
  Bug #2061121 in livecd-rootfs (Ubuntu): "Mantic preseeding of LXD using incorrect track/channel "
  https://bugs.launchpad.net/ubuntu/+source/livecd-rootfs/+bug/2061121

For more details, see:
https://code.launchpad.net/~philroche/livecd-rootfs/+git/livecd-rootfs/+merge/464199
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