chore: config: default-disable kvlog

[magik6k]

KVLog in its current form isn't generated correctly, and so far we didn't see any metadata corruption which couldn't be repaired with normal leveldb repair tools;

At some point it may be worth implementing a v2 of kvlog, but for now I think it's better to disable it by default as it seems to be a constant source of problems.

[codecov]

Codecov Report

Merging #8477 (cc70557) into master (aca9496) will decrease coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #8477      +/-   ##
==========================================
- Coverage   40.77%   40.72%   -0.05%     
==========================================
  Files         686      686              
  Lines       75495    75498       +3     
==========================================
- Hits        30782    30746      -36     
- Misses      39404    39432      +28     
- Partials     5309     5320      +11     

Impacted Files	Coverage Δ
node/config/def.go	97.75% <100.00%> (+0.03%)	⬆️
chain/events/state/fastapi.go	75.00% <0.00%> (-25.00%)	⬇️
chain/events/message_cache.go	87.50% <0.00%> (-12.50%)	⬇️
node/modules/storage.go	76.92% <0.00%> (-7.70%)	⬇️
storage/wdpost_sched.go	75.49% <0.00%> (-5.89%)	⬇️
chain/events/events_called.go	83.90% <0.00%> (-4.40%)	⬇️
extern/storage-sealing/currentdealinfo.go	71.17% <0.00%> (-3.61%)	⬇️
chain/stmgr/searchwait.go	67.30% <0.00%> (-2.57%)	⬇️
chain/sub/incoming.go	59.02% <0.00%> (-2.45%)	⬇️
storage/wdpost_run.go	70.48% <0.00%> (-0.98%)	⬇️
... and 14 more