integration tests: use parquet receiptdb

[jewei1997]

Describe your changes and provide context

Delete the integration test that was for parquet receiptdb and just switch all integration tests to use parquet.

Testing performed to validate your change

existing 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	Apr 23, 2026, 2:00 PM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.28%. Comparing base (b2d56be) to head (bf30d7d).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3298      +/-   ##
==========================================
- Coverage   58.29%   58.28%   -0.01%     
==========================================
  Files        2085     2085              
  Lines      209065   208947     -118     
==========================================
- Hits       121866   121789      -77     
+ Misses      78398    78357      -41     
  Partials     8801     8801              

Flag	Coverage Δ
sei-db	70.41% <ø> (+1.04%)	⬆️

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see 5 files with indirect coverage changes

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