Exercise parallel GIN builds in regression tests

Tomas Vondra <tomas.vondra@postgresql.org>

Commit: 32593394ee439703db558fc4be83de2cb249ded8
Author: Tomas Vondra <tomas.vondra@postgresql.org>
Date: 2026-01-26T19:05:00Z
Releases: 18.2
Exercise parallel GIN builds in regression tests

Modify two places creating GIN indexes in regression tests, so that the
build is parallel. This provides a basic test coverage, even if the
amounts of data are fairly small.

Reported-by: Kirill Reshke <reshkekirill@gmail.com>
Backpatch-through: 18
Discussion: https://postgr.es/m/CALdSSPjUprTj+vYp1tRKWkcLYzdy=N=O4Cn4y_HoxNSqQwBttg@mail.gmail.com

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