Yoast / duplicate-post / 23666031844

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fix(duplicator): prevent race condition in R&R copy creation

Claim the slot on the original post using add_post_meta() with
$unique = true before creating the copy. This returns false if the
meta key already exists, preventing duplicate copies when two concurrent
requests both pass the permission check before either sets the meta.

If wp_insert_post() fails, the claim is rolled back by deleting the
meta.

Also fixes Block_Editor_Test to mock get_post_type_object() for the
restBase addition to the localized JS object.

Ref: Yoast/reserved-tasks#1127

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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