[Merge] lp:~brian-murray/ubuntu-release-upgrader/deb-to-snap into lp:ubuntu-release-upgrader

[Steve Langasek]

FWIW I think it would be nicer if the prompt offered to "retry" the failed snap store check, rather than being just a yes/no dialog; but I don't think that should block this MP.
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https://code.launchpad.net/~brian-murray/ubuntu-release-upgrader/deb-to-snap/+merge/348916
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