Backport release/v6.3: fix: suppress expected ErrAggregateVoteExist error logs in gasless metrics

[seidroid]

Backport of #2796 to release/v6.3.

[github-actions]

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Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Feb 6, 2026, 4:30 PM

[codecov]

Codecov Report

❌ Patch coverage is 12.50000% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 43.37%. Comparing base (4436bed) to head (27d69b3).
⚠️ Report is 1 commits behind head on release/v6.3.

Files with missing lines	Patch %	Lines
app/app.go	12.50%	5 Missing and 2 partials ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##           release/v6.3    #2824   +/-   ##
=============================================
  Coverage         43.36%   43.37%           
=============================================
  Files              1866     1866           
  Lines            155324   155330    +6     
=============================================
+ Hits              67358    67369   +11     
  Misses            81952    81952           
+ Partials           6014     6009    -5     

Flag	Coverage Δ
sei-chain	42.52% <12.50%> (-0.03%)	⬇️
sei-cosmos	38.03% <ø> (-0.01%)	⬇️
sei-db	45.06% <ø> (+0.07%)	⬆️
sei-ibc-go	55.96% <ø> (ø)
sei-tendermint	47.53% <ø> (+0.02%)	⬆️
sei-wasmd	41.56% <ø> (+<0.01%)	⬆️
sei-wasmvm	39.88% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
app/app.go	75.23% <12.50%> (-0.15%)	⬇️

... and 16 files with indirect coverage changes

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