chore(test): address Go usetesting for v3_grpc_test

[Elbehery]

part of #19581

cc @ivanvc

Please read https://github.com/etcd-io/etcd/blob/main/CONTRIBUTING.md#contribution-flow.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.83%. Comparing base (f23c9d7) to head (84ed1cd).
Report is 24 commits behind head on main.

Additional details and impacted files

see 25 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #20086      +/-   ##
==========================================
- Coverage   68.95%   68.83%   -0.13%     
==========================================
  Files         424      424              
  Lines       35788    35788              
==========================================
- Hits        24677    24634      -43     
- Misses       9702     9739      +37     
- Partials     1409     1415       +6     

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[Elbehery]

/assign @ahrtr

[ahrtr]

LGTM & thx

[ivanvc]

LGTM. Thanks, @Elbehery.

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[APPROVALNOTIFIER] This PR is APPROVED

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