dropped orphaned mock

[pompon0]

EventSink mock is provided by internal/state/indexer/mocks with a copy in internal/state/mocks. The latter is not regenerated by "go generate ./...", so I removed it.

[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	Mar 17, 2026, 6:38 PM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.41%. Comparing base (4282c07) to head (a8cb3c3).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3082      +/-   ##
==========================================
- Coverage   58.42%   58.41%   -0.01%     
==========================================
  Files        2088     2088              
  Lines      172108   172080      -28     
==========================================
- Hits       100552   100525      -27     
+ Misses      62620    62618       -2     
- Partials     8936     8937       +1     

Flag	Coverage Δ
sei-chain-pr	33.94% <ø> (?)
sei-db	70.41% <ø> (ø)

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see 28 files with indirect coverage changes

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