Close race condition in slot_creation_error.spec.

Noah Misch <noah@leadboat.com>

Commit: e186f56f9c6ead4ef65848ae6c499f9949b12625
Author: Noah Misch <noah@leadboat.com>
Date: 2022-03-19T01:18:00Z
Releases: 15.0
Close race condition in slot_creation_error.spec.

Use the pattern from detach-partition-concurrently-3.spec.  Per
buildfarm member wrasse.

Reviewed by Kyotaro Horiguchi and Andres Freund.

Discussion: https://postgr.es/m/20220318072837.GC2739027@rfd.leadboat.com

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