implement automatic background updates for devices with the new partition layout

[thestinger]

Blocked on #403. This should be a straightforward feature addition in packages/apps/Updater once the blocking issue is dealt with.

The new generation of devices will have a new partition layout removing the need to reboot in order to install updates. Some research needs to be done to figure out if the same API is used, and then this can be implemented in the Updater app for those new devices. There's probably an API for checking if upgrades as possible without a reboot too. If not, it can just be set in the device repositories.

[thestinger]

Not planning on enhancing the old update app further. CopperheadOS lacks the resources to maintain it, so there's only going to be the legacy update in the current state and a new simplified updater for A/B devices only without a user interface beyond a notification when updates are complete to reboot.

[thestinger]

Not planning on enhancing the old update app further. CopperheadOS lacks the resources to maintain it, so there's only going to be the legacy update in the current state and a new simplified updater for A/B devices only without a user interface beyond a notification when updates are complete to reboot.