Make detach-partition-concurrently-4 less timing sensitive

Alvaro Herrera <alvherre@alvh.no-ip.org>

Commit: eb43bdbf5104c183412aac0fccf8e515e60d9212
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2021-05-25T23:44:55Z
Releases: 14.0
Make detach-partition-concurrently-4 less timing sensitive

Same as 5e0b1aeb2dfe, for the companion test file.

This one seems lower probability (only two failures in a month of runs);
I was hardly able to reproduce a failure without a patch, so the fact
that I was also unable to reproduce one with it doesn't say anything.
We'll have to wait for further buildfarm results to see if we need any
further adjustments.

Discussion: https://postgr.es/m/20210524090712.GA3771394@rfd.leadboat.com

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