fixed ValidatorInfo json encoding

[pompon0]

There were 2 issues:

• for backward compatibility with CosmJS, PubKey needs to be a 0 key in case of non-validator node.
• decoding was broken altogether, because it always returned the zero value of ValidatorInfo

[github-actions]

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Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Mar 24, 2026, 6:36 PM

[codecov]

Codecov Report

❌ Patch coverage is 60.00000% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 58.56%. Comparing base (1141939) to head (914e37a).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
sei-tendermint/rpc/coretypes/responses.go	60.00%	3 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3114      +/-   ##
==========================================
- Coverage   58.62%   58.56%   -0.07%     
==========================================
  Files        2099     2098       -1     
  Lines      173751   173448     -303     
==========================================
- Hits       101867   101578     -289     
+ Misses      62816    62813       -3     
+ Partials     9068     9057      -11     

Flag	Coverage Δ
sei-chain-pr	76.11% <60.00%> (?)
sei-db	70.41% <ø> (ø)

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

Files with missing lines	Coverage Δ
sei-tendermint/rpc/coretypes/responses.go	78.12% <60.00%> (+1.78%)	⬆️

... and 31 files with indirect coverage changes

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[seidroid]

Successfully created backport PR for release/v6.4:

• Backport release/v6.4: fixed ValidatorInfo json encoding #3115