[configgrpc] Send UNAUTHENTICATED on auth failure

[jpkrohling]

Fixes #7646

Signed-off-by: Juraci Paixão Kröhling juraci@kroehling.de

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.38%. Comparing base (4b5f096) to head (5bd3861).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10670      +/-   ##
==========================================
+ Coverage   92.33%   92.38%   +0.05%     
==========================================
  Files         403      403              
  Lines       18734    18729       -5     
==========================================
+ Hits        17298    17303       +5     
+ Misses       1076     1066      -10     
  Partials      360      360              

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[evan-bradley]

I wonder if we should return something like INTERNAL when we get a 404 or 5xx status code from the auth server in cases where the issue is on the Collector's side and not anything related to the caller. But I don't see any good way to do that right now, and this aligns with how the HTTP interceptor works, so LGTM.