refactor giga tests

[codchen]

Describe your changes and provide context

1. use sc instead of legacy store for test
2. pass giga enabled config to constructor so that initialization can be done properly

Testing performed to validate your change

tests

[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	Jan 20, 2026, 12:42 PM

[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	Jan 20, 2026, 12:42 PM

[codecov]

Codecov Report

❌ Patch coverage is 71.42857% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 44.01%. Comparing base (7d1130e) to head (4712ec0).

Files with missing lines	Patch %	Lines
app/test_helpers.go	83.33%	2 Missing ⚠️
giga/executor/config/config.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2716   +/-   ##
=======================================
  Coverage   44.00%   44.01%           
=======================================
  Files        1980     1980           
  Lines      162718   162724    +6     
=======================================
+ Hits        71612    71622   +10     
+ Misses      84590    84585    -5     
- Partials     6516     6517    +1     

Flag	Coverage Δ
sei-chain	46.20% <71.42%> (+<0.01%)	⬆️
sei-cosmos	38.21% <ø> (ø)
sei-db	68.72% <ø> (ø)
sei-tendermint	47.30% <ø> (+0.01%)	⬆️

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	33.16% <83.33%> (+0.34%)	⬆️
giga/executor/config/config.go	0.00% <0.00%> (ø)

... and 17 files with indirect coverage changes

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