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

[Philip Roche]

The proposal to merge ~philroche/livecd-rootfs/+git/livecd-rootfs:bugfix/lp-2061121-snap-preseed-latest into livecd-rootfs:ubuntu/mantic has been updated.

Commit message changed to:

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"

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

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