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

[Philip Roche]

> also, wouldn't this end up affecting every other snap that doesn't have it encoded or a specific version passed in? so if you just request a pre_seed of $my_snap it'll go to `latest/stable/ubuntu-$(release_version)` which doesn't match the policy...

Only if their default track is not "latest" which is what happened with LXD. And if a snap did have a default track that was not "latest" then it would need to ensure that if had a "stable/ubuntu-23.10" channel created in that track otherwise that too would fail. 
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https://code.launchpad.net/~philroche/livecd-rootfs/+git/livecd-rootfs/+merge/464199
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