[wp-trac] [WordPress Trac] #57532: Backport the pattern categories migration

[WordPress Trac]

#57532: Backport the pattern categories migration
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 Reporter:  ntsekouras   |      Owner:  ntsekouras
     Type:  enhancement  |     Status:  assigned
 Priority:  normal       |  Milestone:  Awaiting Review
Component:  Editor       |    Version:
 Severity:  normal       |   Keywords:
  Focuses:               |
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 This ticket tracks the addition of pattern categories migration in
 `WP_REST_Block_Patterns_Controller`.

 Related GB PR: https://github.com/WordPress/gutenberg/pull/46144.

 Part of the GB PR was merged in this changeset:
 https://core.trac.wordpress.org/changeset/55098

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Ticket URL: <https://core.trac.wordpress.org/ticket/57532>
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