Remove pg_spin_delay().

Nathan Bossart <nathan@postgresql.org>

Commit: ae27a41e0c7f1d1c451aff230cac32fc7cdb1fee
Author: Nathan Bossart <nathan@postgresql.org>
Date: 2026-06-30T15:57:54Z
Releases: master
Remove pg_spin_delay().

This code appears to be an artifact from commit b64d92f1a5 that was
never used for anything.

Reviewed-by: Corey Huinker <corey.huinker@gmail.com>
Discussion: https://postgr.es/m/afouZUH_eUkIj4i4%40nathan

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