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
I didn't include this test in 2f6501fa3c5, because I was not sure the error messages for the terminated connection is stable across platforms. But it sounds like it is, and if not, we'd want to do something about the instability anyway... Discussion: https://postgr.es/m/CAD21AoDAeEpAbZEyYJsPZJUmSPaRicVSBObaL7sPaofnKz+9zg@mail.gmail.com
