Test coverage for COMMANDLOG HELP

[zuiderkwast]

Fixes reply-schema-validator test job which needs coverage for all commands.

Failing job: https://github.com/valkey-io/valkey/actions/runs/12969591890/job/36173810824

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.98%. Comparing base (9071a5c) to head (8363aeb).
Report is 1 commits behind head on unstable.

Additional details and impacted files

@@             Coverage Diff              @@
##           unstable    #1617      +/-   ##
============================================
+ Coverage     70.85%   70.98%   +0.12%     
============================================
  Files           121      121              
  Lines         65169    65169              
============================================
+ Hits          46176    46260      +84     
+ Misses        18993    18909      -84     

see 12 files with indirect coverage changes