Track connection errors in grpc_go

[grcevski]

Add code to ensure we can track failed gRPC connections in Go.

TODO:

• Integration tests

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.74%. Comparing base (a22db74) to head (fb63622).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #852      +/-   ##
==========================================
+ Coverage   79.63%   79.74%   +0.10%     
==========================================
  Files         117      117              
  Lines        8050     8054       +4     
==========================================
+ Hits         6411     6423      +12     
+ Misses       1231     1226       -5     
+ Partials      408      405       -3     

Flag	Coverage Δ
integration-test	56.42% <100.00%> (+0.17%)	⬆️
k8s-integration-test	65.11% <100.00%> (-0.07%)	⬇️
oats-test	35.89% <100.00%> (+0.34%)	⬆️
unittests	46.25% <0.00%> (+0.25%)	⬆️

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