chore: update integration test doc to the correct paths

[mojtaba-esk]

Describe your changes and provide context

Fix integration test README: use real test path instead of non-existent test.yaml

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	Feb 20, 2026, 11:36 AM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.42%. Comparing base (933111a) to head (9ea47f0).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2915   +/-   ##
=======================================
  Coverage   68.42%   68.42%           
=======================================
  Files           5        5           
  Lines         456      456           
=======================================
  Hits          312      312           
  Misses        114      114           
  Partials       30       30           

Flag	Coverage Δ
sei-db	68.42% <ø> (ø)

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