InitChain cleanup

[pompon0]

• ResponseInitChain.ConsensusParams was never set
• RequestInitChain.Validators was just compared against ResponseInitChain.Validators
• Removed unused test helpers
• Removed unused mocks
• plain_types.go getters were unused
• bunch of types in plain_types.go were unused
• fixed misleading descriptions on InitGenesis of cosmos modules (whether they returned ValidatorUpdates)

[github-actions]

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Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Mar 26, 2026, 7:21 PM

[codecov]

Codecov Report

❌ Patch coverage is 78.94737% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 58.68%. Comparing base (d91ffb4) to head (f97c4c8).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
sei-tendermint/internal/consensus/replay.go	72.72%	3 Missing and 3 partials ⚠️
sei-tendermint/rpc/test/helpers.go	60.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3121      +/-   ##
==========================================
+ Coverage   58.39%   58.68%   +0.29%     
==========================================
  Files        2099     2099              
  Lines      173536   173254     -282     
==========================================
+ Hits       101334   101677     +343     
+ Misses      63156    62533     -623     
+ Partials     9046     9044       -2     

Flag	Coverage Δ
sei-chain-pr	65.84% <78.94%> (?)
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
app/test_helpers.go	63.30% <ø> (-0.09%)	⬇️
sei-cosmos/baseapp/abci.go	61.73% <100.00%> (+0.31%)	⬆️
sei-cosmos/x/genutil/module.go	48.07% <ø> (ø)
sei-cosmos/x/staking/module.go	62.66% <ø> (ø)
sei-ibc-go/testing/simapp/test_helpers.go	50.45% <ø> (-0.45%)	⬇️
sei-tendermint/abci/types/plain_types.go	28.57% <ø> (+22.74%)	⬆️
sei-tendermint/internal/state/execution.go	79.41% <100.00%> (+5.09%)	⬆️
sei-tendermint/test/e2e/app/app.go	0.00% <ø> (ø)
sei-tendermint/types/genesis.go	86.48% <100.00%> (+0.97%)	⬆️
sei-wasmd/app/test_helpers.go	41.89% <ø> (-0.23%)	⬇️
... and 3 more

... and 30 files with indirect coverage changes

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