Add unit test to make sure historical queries only serve from SS

[yzang2019]

Describe your changes and provide context

This PR add a unit test to make sure historical queries are only served from SS store, not SC, avoiding the possibility of serving inconsistent data for RPC queries

Testing performed to validate your change

[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	Nov 14, 2025, 5:04 PM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 39.68%. Comparing base (df421b4) to head (6b9d7ce).
⚠️ Report is 561 commits behind head on main.

❌ Your project check has failed because the head coverage (48.84%) is below the target coverage (50.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2548      +/-   ##
==========================================
- Coverage   43.20%   39.68%   -3.52%     
==========================================
  Files        1531     1004     -527     
  Lines      131336    98438   -32898     
==========================================
- Hits        56738    39069   -17669     
+ Misses      69575    55804   -13771     
+ Partials     5023     3565    -1458     

Flag	Coverage Δ
sei-chain	31.10% <ø> (ø)
sei-cosmos	?
sei-db	47.60% <ø> (-21.46%)	⬇️
sei-tendermint	48.83% <ø> (-0.04%)	⬇️
sei-wasmd	46.26% <ø> (ø)
sei-wasmvm	40.37% <ø> (ø)

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see 628 files with indirect coverage changes

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[github-actions]

We truly appreciate your contribution and the time you’ve invested in this PR.
Before we can merge it, we’d love your help addressing the remaining feedback or sharing your perspective.
If we don’t hear back within 2 day(s), this PR will close automatically — but don’t worry, you can reopen it anytime when you’re ready to continue.