Skip coverage job on merge_group events

[masih]

Coverage is already collected and reported during the PR. Running it again in the merge queue adds latency without providing new data. Race detection still runs for merge_group to preserve correctness guarantees.

[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 2, 2026, 7:24 PM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.62%. Comparing base (3ccf8e6) to head (0256756).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3172      +/-   ##
==========================================
- Coverage   58.71%   58.62%   -0.09%     
==========================================
  Files        2055     2055              
  Lines      168425   168268     -157     
==========================================
- Hits        98883    98649     -234     
- Misses      60748    60845      +97     
+ Partials     8794     8774      -20     

Flag	Coverage Δ
sei-db	70.41% <ø> (ø)

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see 44 files with indirect coverage changes

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