Add OCC conflict and block execution logs

[codchen]

Summary

• Adds OCC scheduler conflict-key logging for both sei-cosmos/tasks/scheduler.go and giga/deps/tasks/scheduler.go.
• Adds ValidateTransactionStateWithKeys so the schedulers can include the conflicting store keys while preserving the existing ValidateTransactionState API.
• Emits a single aggregated occ scheduler key conflicts log line per block when OCC retries happen, with counts grouped by store/key.
• Adds an execution block time log at commit with block_txs, process_proposal_ms, finalize_block_ms, commit_ms, and total_execution_ms.

This PR is now logging-only. The original larger PR has been split into:

• Stress tooling: Add EVM stress workload tooling #3404
• EVM execution optimizations: Optimize conflict-heavy EVM transfer execution #3405

Test Plan

• go test ./sei-cosmos/store/multiversion ./sei-cosmos/tasks ./giga/deps/tasks ./sei-cosmos/baseapp

[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	May 7, 2026, 4:53 AM

[codecov]

Codecov Report

❌ Patch coverage is 64.93506% with 27 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.03%. Comparing base (ab54587) to head (8262833).

Files with missing lines	Patch %	Lines
giga/deps/tasks/scheduler.go	0.00%	24 Missing ⚠️
sei-cosmos/tasks/scheduler.go	87.50%	1 Missing and 2 partials ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3376   +/-   ##
=======================================
  Coverage   59.03%   59.03%           
=======================================
  Files        2105     2105           
  Lines      173300   173363   +63     
=======================================
+ Hits       102312   102353   +41     
- Misses      62104    62126   +22     
  Partials     8884     8884           

Flag	Coverage Δ
sei-chain-pr	67.31% <64.93%> (?)
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-cosmos/baseapp/abci.go	63.00% <100.00%> (+1.07%)	⬆️
sei-cosmos/baseapp/baseapp.go	75.80% <ø> (ø)
sei-cosmos/store/multiversion/store.go	91.96% <100.00%> (+0.29%)	⬆️
sei-cosmos/tasks/scheduler.go	94.88% <87.50%> (-0.74%)	⬇️
giga/deps/tasks/scheduler.go	84.26% <0.00%> (-7.35%)	⬇️

... and 1 file with indirect coverage changes

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