Rationalize error comments in partition split/merge tests

John Naylor <john.naylor@postgresql.org>

Commit: ecb2508aaf9b978871734ea2fdf701ab7d593d0a
Author: John Naylor <john.naylor@postgresql.org>
Date: 2026-05-07T12:10:51Z
Rationalize error comments in partition split/merge tests

The regression tests had a copy of the full error, detail, and hint
text in comments above each failing statement in the .sql files. This
is a maintenance hazard, so simplify to "-- ERROR", in line with
other tests.

Author: Ayush Tiwari <ayushtiwari.slg01@gmail.com>
Reviewed-by: Jian He <jian.universality@gmail.com>
Discussion: https://postgr.es/m/CANWCAZap26BRLwtd+A7GFDSD6-+C3F0NVdUGUAu2LUfvpOTy=w@mail.gmail.com

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