[wp-trac] [WordPress Trac] #61282: Backport theme.json version 3 migrations

[WordPress Trac]

#61282: Backport theme.json version 3 migrations
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 Reporter:  ajlende      |      Owner:  (none)
     Type:  enhancement  |     Status:  new
 Priority:  normal       |  Milestone:  Awaiting Review
Component:  General      |    Version:
 Severity:  normal       |   Keywords:
  Focuses:               |
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 Backport of the following Gutenberg PRs

 * https://github.com/WordPress/gutenberg/pull/58409
 * https://github.com/WordPress/gutenberg/pull/61328
 * https://github.com/WordPress/gutenberg/pull/61842

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Ticket URL: <https://core.trac.wordpress.org/ticket/61282>
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