New /admin/upgrade-versions UI; compareVersions function

[berekuk]

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Latest commit: 2ffceb2

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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Name	Status	Preview	Updated (UTC)
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[berekuk]

This PR is 99% admin-only code, so I'm going to merge it without the review.