Return status code exceptions via CompletableResultCode in GrpcExporter and HttpExporter

[jarrodrobins]

Building off of @jack-berg's PR #6348, this PR uses the newly added CompletableResultCode's failExceptionally method to return status code errors from the GrpcExporter and HttpExporter.

The intention is to expose the status code upstream so it can be responded to, rather than simply have an 'unknown' failure. This was requested #6306. There was some discussion there around parsing response bodies which sounded like it was quite complicated; I have just focused on the basic case of returning the HTTP or GRPC status code.

This is my first PR into OpenTelemetry so please let me know if what I've done should be done differently or if you have suggestions for a better way.

I initially had separate exceptions for the GrpcExporter and HttpExporters, but this seemed like overkill considering they did the same thing. Additionally, I wasn't sure if there was a better package for the exception itself - I've put it in the internal package currently with the associated code.

Please take a look - happy to make changes as necesssary.

[linux-foundation-easycla]

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• ✅ login: jarrodrobins / name: Jarrod Robins (cb9919d, 0fa7023, 3ad57cf, 039ca4c, ebf8915)

[codecov]

Codecov Report

Attention: Patch coverage is 92.85714% with 3 lines in your changes missing coverage. Please review.

Project coverage is 90.09%. Comparing base (7522bfe) to head (039ca4c).
Report is 1 commits behind head on main.

Files	Patch %	Lines
...telemetry/exporter/internal/grpc/GrpcExporter.java	80.00%	1 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #6645   +/-   ##
=========================================
  Coverage     90.09%   90.09%           
- Complexity     6280     6287    +7     
=========================================
  Files           697      698    +1     
  Lines         18951    18978   +27     
  Branches       1858     1861    +3     
=========================================
+ Hits          17073    17099   +26     
  Misses         1305     1305           
- Partials        573      574    +1     

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[jarrodrobins]

Thanks @jack-berg, I've updated my PR to include your suggestion. I also broke out the logging into a separate method. Take a look, I think I'm handling the gRPC error codes correctly (I looked at what OkHttpGrpcSender was doing). Let me know if you need me to make any other changes.

[jack-berg]

Just a couple of small comments but this looks pretty good. Thanks!

[jarrodrobins]

Thanks @jack-berg, I've made those changes.