Deflake test failures due to port already in use

[masih]

Use a cross process locking to avid port conflict when tests are run in parallel across multiple binaries.

Make gRPCWeb optional, for tests that really need it. Disabled by default.

[github-actions]

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Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Feb 20, 2026, 3:27 PM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.32%. Comparing base (421c1dc) to head (6fa8b23).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2942       +/-   ##
===========================================
+ Coverage   57.76%   68.32%   +10.55%     
===========================================
  Files        2111        7     -2104     
  Lines      174240      502   -173738     
===========================================
- Hits       100653      343   -100310     
+ Misses      64631      125    -64506     
+ Partials     8956       34     -8922     

Flag	Coverage Δ
sei-chain	67.39% <ø> (+9.65%)	⬆️
sei-db	68.42% <ø> (ø)

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see 2104 files with indirect coverage changes

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