Upgrade to go 1.27 and address lint issues

[masih]

Upgrade the entire go module to latest go 1.27.1 and address lint issues, adjust CI builds, etc.

[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	Sep 4, 2026, 2:12 PM

[codecov]

Codecov Report

❌ Patch coverage is 46.69540% with 371 lines in your changes missing coverage. Please review.
✅ Project coverage is 62.75%. Comparing base (b936c65) to head (62f139d).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
sei-cosmos/x/bank/client/testutil/suite.go	0.00%	40 Missing ⚠️
sei-cosmos/x/authz/client/testutil/tx.go	0.00%	29 Missing ⚠️
sei-cosmos/x/distribution/client/testutil/suite.go	0.00%	29 Missing ⚠️
sei-cosmos/x/staking/client/testutil/suite.go	0.00%	24 Missing ⚠️
sei-db/db_engine/litt/cli/litt_cli.go	0.00%	21 Missing ⚠️
sei-cosmos/x/auth/client/testutil/helpers.go	0.00%	19 Missing ⚠️
sei-cosmos/x/gov/client/testutil/suite.go	0.00%	15 Missing ⚠️
giga/deps/xevm/types/gov.go	12.50%	14 Missing ⚠️
x/evm/types/gov.go	12.50%	14 Missing ⚠️
evmrpc/block_trace_profiled.go	0.00%	13 Missing ⚠️
... and 51 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4098      +/-   ##
==========================================
+ Coverage   61.32%   62.75%   +1.43%     
==========================================
  Files        2190     2100      -90     
  Lines      192360   182061   -10299     
==========================================
- Hits       117956   114251    -3705     
+ Misses      63249    61456    -1793     
+ Partials    11155     6354    -4801     

Flag	Coverage Δ
sei-chain-pr	63.05% <46.29%> (?)
sei-db	74.50% <ø> (+4.70%)	⬆️
sei-db-state-db	?
sei-db-state-db-pr	83.81% <85.71%> (?)

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

Files with missing lines	Coverage Δ
cmd/autobahn-e2e/command.go	25.58% <ø> (+2.32%)	⬆️
cmd/autobahn-e2e/forward.go	25.00% <100.00%> (+5.00%)	⬆️
cmd/autobahn-e2e/teardown.go	45.76% <100.00%> (+20.33%)	⬆️
config/registry/registry.go	99.22% <100.00%> (+0.77%)	⬆️
config/registry/resolve.go	96.75% <100.00%> (+1.38%)	⬆️
evmrpc/block.go	87.50% <100.00%> (+8.22%)	⬆️
evmrpc/info.go	86.57% <100.00%> (+9.88%)	⬆️
evmrpc/server.go	89.86% <100.00%> (+4.14%)	⬆️
evmrpc/subscribe.go	79.37% <100.00%> (+5.94%)	⬆️
evmrpc/tests/mock_client.go	53.89% <100.00%> (+4.54%)	⬆️
... and 119 more

... and 455 files with indirect coverage changes

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