Cleanup blocksim benchmarks

[cody-littley]

Describe your changes and provide context

• fix blocksim + littDB metrics
• configuration for blocksim benchmarks
• fix LittDB bug that was introduced by the secondary key feature added recently (triggered by blocksim workload)

[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	Jul 1, 2026, 5:21 PM

[codecov]

Codecov Report

❌ Patch coverage is 61.24031% with 50 lines in your changes missing coverage. Please review.
✅ Project coverage is 58.36%. Comparing base (d4cb291) to head (bdbc44e).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...ei-db/ledger_db/block/blocksim/blocksim_metrics.go	0.00%	19 Missing ⚠️
sei-db/ledger_db/block/blocksim/blocksim.go	7.69%	12 Missing ⚠️
sei-db/ledger_db/block/blocksim/block_generator.go	82.92%	6 Missing and 1 partial ⚠️
sei-db/db_engine/litt/disktable/control_loop.go	40.00%	2 Missing and 1 partial ⚠️
sei-db/ledger_db/block/blocksim/blocksim_config.go	70.00%	3 Missing ⚠️
sei-tendermint/autobahn/types/proposal.go	83.33%	2 Missing and 1 partial ⚠️
sei-tendermint/autobahn/types/testonly.go	87.50%	1 Missing and 1 partial ⚠️
sei-db/db_engine/litt/disktable/disk_table.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3683      +/-   ##
==========================================
- Coverage   59.27%   58.36%   -0.92%     
==========================================
  Files        2272     2185      -87     
  Lines      188193   178488    -9705     
==========================================
- Hits       111547   104167    -7380     
+ Misses      66593    65075    -1518     
+ Partials    10053     9246     -807     

Flag	Coverage Δ
sei-chain-pr	69.18% <61.24%> (?)
sei-db	70.41% <ø> (ø)
sei-db-state-db	?

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

Files with missing lines	Coverage Δ
sei-db/db_engine/litt/disktable/segment/segment.go	68.24% <ø> (+1.01%)	⬆️
sei-db/db_engine/litt/littbuilder/build_utils.go	52.23% <100.00%> (+1.48%)	⬆️
sei-db/db_engine/litt/littdb_config.go	51.42% <100.00%> (+0.70%)	⬆️
sei-db/db_engine/litt/table.go	100.00% <ø> (ø)
sei-tendermint/autobahn/types/block.go	83.33% <100.00%> (+0.40%)	⬆️
sei-db/db_engine/litt/disktable/disk_table.go	69.98% <0.00%> (+2.28%)	⬆️
sei-tendermint/autobahn/types/testonly.go	93.75% <87.50%> (-0.70%)	⬇️
sei-db/db_engine/litt/disktable/control_loop.go	67.27% <40.00%> (-0.51%)	⬇️
sei-db/ledger_db/block/blocksim/blocksim_config.go	41.42% <70.00%> (-0.11%)	⬇️
sei-tendermint/autobahn/types/proposal.go	92.76% <83.33%> (-0.35%)	⬇️
... and 3 more

... and 90 files with indirect coverage changes

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