[wp-trac] [WordPress Trac] #58677: Backport: move new wp_block postmeta field to a top level field of wp_block in rest responses

[WordPress Trac]

#58677: Backport: move new wp_block postmeta field to a top level field of wp_block
in rest responses
--------------------------+-----------------------------
 Reporter:  glendaviesnz  |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Editor        |    Version:
 Severity:  normal        |   Keywords:
  Focuses:                |
--------------------------+-----------------------------
 As [discussed here](https://github.com/WordPress/wordpress-
 develop/pull/4646#issuecomment-1603668189)  this moves the `sync_status`
 postmeta to a top level field of `wp_block`, and also renames it to
 `wp_sync_status` as [discussed
 here](https://wordpress.slack.com/archives/C02QB2JS7/p1688091498250399).

 The rename to `wp_sync_status` is not 100% confirmed yet, we can back that
 out if needed.

 [Related GB PR.](https://github.com/WordPress/gutenberg/pull/52146)

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Ticket URL: <https://core.trac.wordpress.org/ticket/58677>
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