Use command_ok for pg_regress calls in 002_pg_upgrade and 027_stream_regress

Andrew Dunstan <andrew@dunslane.net>

Commit: bb6ae9707c1789c9d2036c9bbd35965a01e1b214
Author: Andrew Dunstan <andrew@dunslane.net>
Date: 2026-04-02T12:13:44Z
Use command_ok for pg_regress calls in 002_pg_upgrade and 027_stream_regress

Now that command_ok() captures and displays failure output, use it
instead of system() plus manual diff-dumping in these two tests.  This
simplifies both scripts and produces consistent, truncated output on
failure.

Author: Jelte Fennema-Nio <postgres@jeltef.nl>
Reviewed-by: Andrew Dunstan <andrew@dunslane.net>
Reviewed-by: Corey Huinker <corey.huinker@gmail.com>
Discussion: https://postgr.es/m/DFYFWM053WHS.10K8ZPJ605UFK@jeltef.nl

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