Migrate tendermint logging to slog and remove go-kit/log dependency

[masih]

Remove dependency to go-kit/log and logfmt, and adapt existing logging utility libraries to use Go SDK's slog

The changes here intentionally aim to introduce as little changes as possible, and are part of the larger integration of seilog, an extended slog library into sei-chain.

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Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Mar 2, 2026, 3:17 PM

[codecov]

Codecov Report

❌ Patch coverage is 84.15301% with 29 lines in your changes missing coverage. Please review.
✅ Project coverage is 60.56%. Comparing base (94a7bad) to head (731e05d).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
sei-tendermint/libs/log/tm_logger.go	87.94%	14 Missing and 3 partials ⚠️
sei-tendermint/libs/log/testing_logger.go	33.33%	2 Missing and 2 partials ⚠️
sei-tendermint/libs/log/nop.go	60.00%	2 Missing ⚠️
cmd/seid/cmd/blocktest.go	0.00%	1 Missing ⚠️
cmd/seid/cmd/ethreplay.go	0.00%	1 Missing ⚠️
cmd/seid/cmd/snapshot.go	0.00%	1 Missing ⚠️
sei-cosmos/client/pruning/main.go	0.00%	1 Missing ⚠️
sei-tendermint/libs/log/testing.go	87.50%	1 Missing ⚠️
tools/migration/sc/migrator.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2987       +/-   ##
===========================================
+ Coverage   58.22%   60.56%    +2.34%     
===========================================
  Files        2113       76     -2037     
  Lines      173639    11630   -162009     
===========================================
- Hits       101093     7044    -94049     
+ Misses      63534     3931    -59603     
+ Partials     9012      655     -8357     

Flag	Coverage Δ
sei-chain-pr	60.15% <84.15%> (?)
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/internal/p2p/conn/oldmux.go	94.00% <100.00%> (+1.25%)	⬆️
sei-tendermint/libs/log/default.go	100.00% <100.00%> (+25.49%)	⬆️
sei-tendermint/node/node.go	58.13% <100.00%> (-2.07%)	⬇️
cmd/seid/cmd/blocktest.go	0.00% <0.00%> (ø)
cmd/seid/cmd/ethreplay.go	0.00% <0.00%> (ø)
cmd/seid/cmd/snapshot.go	0.00% <0.00%> (ø)
sei-cosmos/client/pruning/main.go	0.00% <0.00%> (ø)
sei-tendermint/libs/log/testing.go	61.53% <87.50%> (+11.53%)	⬆️
tools/migration/sc/migrator.go	0.00% <0.00%> (ø)
sei-tendermint/libs/log/nop.go	66.66% <60.00%> (-33.34%)	⬇️
... and 2 more

... and 2042 files with indirect coverage changes

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[masih]

Coverage drop is miss-leading and a result of partial to full comparison. Fixed separately here: #2989

[masih]

Flaking test fixed here.