Provide out-of-lifed image warning in status

In Universal Blue we add a message to the user's terminal motd when they're on an image older than 90 days to remind them that they need to upgrade. This has been pretty useful and I've been thinking of how this can just be built into bootc if people think it's a good idea.

Maybe adding it to `bootc status` with the eol date of the image and then there's a visual indicator if it's past it's freshness date.

Then to go along with that maybe we could add a label, random example `containers.bootc.eol-date` so that can be adjusted depending on the use case, then people can just centralize that as policy when they build and push. Or maybe just surface `quay.expires-after`? Might be useful for QA folks who'll end up testing a bunch of development images, etc.

No file, test, or entry point is named. First clarify whether bootc status should report an image end-of-life date, a freshness warning, or both, and which metadata source and label policy should apply. Done would require an agreed behavior and acceptance criteria before implementation can be located.

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