oauth_validator: Shorten JSON responses in test logs

Jacob Champion <jchampion@postgresql.org>

Commit: 47c7a7ebc89eb6b8cf81c937885864f994784d38
Author: Jacob Champion <jchampion@postgresql.org>
Date: 2025-11-26T04:39:47Z
oauth_validator: Shorten JSON responses in test logs

Response padding from the oauth_validator abuse tests was adding a
couple megabytes to the test logs. We don't need the buildfarm to hold
onto that, and we don't need to read it when debugging; truncate it.

Reported-by: Álvaro Herrera <alvherre@kurilemu.de>
Discussion: https://postgr.es/m/202511251218.zfs4nu2qnh2m%40alvherre.pgsql
Backpatch-through: 18

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