moved eviction from mempool to mempool reactor

[pompon0]

Also fixed the lifecycle of failure counter entries - they were never cleaned up previously.

[github-actions]

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Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Apr 8, 2026, 4:34 PM

[codecov]

Codecov Report

❌ Patch coverage is 86.95652% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 58.80%. Comparing base (8d751f6) to head (4e0faa9).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
sei-tendermint/internal/mempool/reactor.go	84.00%	2 Missing and 2 partials ⚠️
sei-tendermint/internal/p2p/testonly.go	75.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3210      +/-   ##
==========================================
+ Coverage   58.79%   58.80%   +0.01%     
==========================================
  Files        2054     2054              
  Lines      168303   168307       +4     
==========================================
+ Hits        98948    98977      +29     
+ Misses      60609    60589      -20     
+ Partials     8746     8741       -5     

Flag	Coverage Δ
sei-chain-pr	70.07% <86.95%> (?)
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/consensus/replay.go	69.13% <100.00%> (ø)
sei-tendermint/internal/consensus/replay_stubs.go	83.33% <ø> (+6.41%)	⬆️
sei-tendermint/internal/mempool/mempool.go	72.16% <100.00%> (-0.04%)	⬇️
sei-tendermint/internal/mempool/types.go	64.70% <ø> (ø)
sei-tendermint/internal/state/execution.go	78.71% <ø> (+0.77%)	⬆️
sei-tendermint/node/setup.go	66.41% <ø> (-0.13%)	⬇️
sei-tendermint/internal/p2p/testonly.go	76.00% <75.00%> (-0.04%)	⬇️
sei-tendermint/internal/mempool/reactor.go	76.68% <84.00%> (+6.13%)	⬆️

... and 4 files with indirect coverage changes

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