[Merge] ~ubuntu-core-dev/ubuntu-seeds/+git/ubuntu:canary-enhanced-seeds into ~ubuntu-core-dev/ubuntu-seeds/+git/ubuntu:mantic

[Michael Hudson-Doyle]

> With mantic we switched to using seeds instead of tasks, so all the task-related fields don't seem needed.

Well... that's not really the full picture I'd say. Tasks are still a thing, they are just handled inside the livecd-rootfs build rather than via Task headers in the Packages file. The Task- headers still make a difference in some cases.

Anyway, what is the purpose of this seed? Do we expect to change livecd-rootfs to say "add_task enhanced-secure-boot" instead of the "add_package boot-managed-by-snapd"?
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https://code.launchpad.net/~ubuntu-core-dev/ubuntu-seeds/+git/ubuntu/+merge/448719
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