Revert "Reject degenerate SPLIT PARTITION with DEFAULT partition"

Alexander Korotkov <akorotkov@postgresql.org>

Commit: 0392fb900eb89f52988cccd33046443c39c70d1c
Author: Alexander Korotkov <akorotkov@postgresql.org>
Date: 2026-05-20T20:23:49Z
Revert "Reject degenerate SPLIT PARTITION with DEFAULT partition"

This reverts commit d8af73010033cb8ad6c941942d6b03d74d7e4f7e.  Per buildfarm
failures.

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