[Merge] ~brian-murray/ubuntu-seeds:eoan into ~ubuntu-core-dev/ubuntu-seeds/+git/platform:eoan

[Steve Langasek]

Review: Needs Information

My expectation was that we would avoid seeding this by default in the image, but that doesn't mean it would be unseeded from main.  Shouldn't this be moving into one of the 'supported' seeds, rather than being dropped completely?
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https://code.launchpad.net/~brian-murray/ubuntu-seeds/+git/ubuntu-seeds/+merge/372030
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