[Merge] ~nteodosio/update-manager:main into update-manager:main

[Nathan Teodosio]

Makes sense, I'll submit again.

> Oh, and one extra question: in which version was the API you use added to ubuntu-advantage-tools? Do we need to update our Depends?

I think not, it is there since 27.12. As far as I know, we are not backporting this to other releases, as the flag is only going to be removed from 24.04 on.
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https://code.launchpad.net/~nteodosio/update-manager/+git/update-manager/+merge/456053
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