Fix flaky TestClientMethodCalls by using eventual time assertion

[masih]

Switch to using eventual arrival of events instead of a fixed timeout.

Also refine the coverage config to avoid miss leading patch coverage diff on small changes.

Flaked on main.

[github-actions]

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Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Feb 23, 2026, 9:27 AM

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 69.30%. Comparing base (bfb3d64) to head (4119180).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
sei-tendermint/rpc/client/helpers.go	50.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2946       +/-   ##
===========================================
+ Coverage   57.83%   69.30%   +11.47%     
===========================================
  Files        2110        6     -2104     
  Lines      174124      492   -173632     
===========================================
- Hits       100711      341   -100370     
+ Misses      64451      118    -64333     
+ Partials     8962       33     -8929     

Flag	Coverage Δ
sei-chain	80.00% <50.00%> (+22.18%)	⬆️
sei-db	68.49% <ø> (ø)

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Files with missing lines	Coverage Δ
sei-tendermint/rpc/client/helpers.go	80.00% <50.00%> (-2.36%)	⬇️

... and 2104 files with indirect coverage changes

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