fix(sei-tendermint): resolve staticcheck warnings

[amir-deris]

Summary

Resolves some of the staticcheck warnings in the sei-tendermint package by removing unused code and fixing unchecked errors.

• Removed dead code: sha256trunc type, bindFlagsLoadViper, validateOutput, interfaceWrapper, sortedCopy, containsAny, containsAll, contains, unused constants (BlockSize, TruncatedSize), and routerRestartCh field
• Fixed unused variables in tests (idx, val, addr, sender, maxIn)
• Added missing require.NoError for errors previously silently ignored in reactor_test.go and state_test.go
• Suppressed false positive for extCommitKey with a lint ignore directive

[github-actions]

The latest Buf updates on your PR. Results from workflow Buf / buf (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Apr 8, 2026, 4:50 PM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.82%. Comparing base (36f9664) to head (809bd9d).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3207      +/-   ##
==========================================
- Coverage   58.92%   58.82%   -0.11%     
==========================================
  Files        2060     2054       -6     
  Lines      168733   168215     -518     
==========================================
- Hits        99433    98945     -488     
+ Misses      60592    60536      -56     
- Partials     8708     8734      +26     

Flag	Coverage Δ
sei-chain-pr	73.81% <ø> (?)
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/crypto/tmhash/hash.go	60.00% <ø> (+41.25%)	⬆️
sei-tendermint/internal/store/store.go	59.94% <ø> (ø)
sei-tendermint/libs/cli/setup.go	58.18% <ø> (+14.93%)	⬆️
sei-tendermint/libs/json/decoder.go	73.45% <ø> (ø)
sei-tendermint/node/node.go	59.36% <ø> (ø)
sei-tendermint/types/tx.go	91.42% <ø> (+21.86%)	⬆️

... and 61 files with indirect coverage changes

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[bdchatham]

LGTM