[Test Failure] Sometimes failing valgrind test

[madolson]

We sometimes get a valgrind failure with no error, just printing out valgrind text:

Example: https://github.com/valkey-io/valkey/actions/runs/12474649298/job/34816982513

!!! WARNING The following tests failed:

*** [err]: Valgrind error: ==90396== Memcheck, a memory error detector
==90396== Copyright (C) 2002-2022, and GNU GPL'd, by Julian Seward et al.
==90396== Using Valgrind-3.22.0 and LibVEX; rerun with -h for copyright info
==90396== Command: src/valkey-server ./tests/tmp/valkey.conf.3985.1683
==90396== 

There might be more of an error that is getting truncated. Not sure what is causing it.

[madolson]

Looking into this quickly, I'm guessing the report isn't fully written out yet, because it's missing some elements like "definitely lost" and such.