stats/opentelemetry: record retry attempts from clientStream

[vinothkumarr227]

Fixes: https://github.com/grpc/grpc-go/issues/8299

RELEASE NOTES:

• stats/opentelemetry: Retry attempts (grpc.previous-rpc-attempts) are now recorded as span attributes for non-transparent client retries.

[codecov[bot]]

Codecov Report

:x: Patch coverage is 52.63158% with 9 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 81.50%. Comparing base (e60a04b) to head (c0e523c). :warning: Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
stats/opentelemetry/client_tracing.go	52.63%	6 Missing and 3 partials :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8342      +/-   ##
==========================================
- Coverage   81.64%   81.50%   -0.15%     
==========================================
  Files         413      413              
  Lines       40621    40693      +72     
==========================================
- Hits        33167    33166       -1     
- Misses       5991     6000       +9     
- Partials     1463     1527      +64     

Files with missing lines	Coverage Δ
stats/opentelemetry/opentelemetry.go	50.94% <ø> (-26.97%)	:arrow_down:
stats/opentelemetry/trace.go	41.07% <ø> (-47.82%)	:arrow_down:
stats/opentelemetry/client_tracing.go	55.31% <52.63%> (-32.19%)	:arrow_down:

... and 24 files with indirect coverage changes

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[arjan-bal]

@vinothkumarr227 there is a failure in the updated test reported by codecov: https://github.com/grpc/grpc-go/actions/runs/16616024027/job/47008766111?pr=8342

PTAL and ensure the test is not flaky.

[vinothkumarr227]

@vinothkumarr227 there is a failure in the updated test reported by codecov: https://github.com/grpc/grpc-go/actions/runs/16616024027/job/47008766111?pr=8342

PTAL and ensure the test is not flaky.

Sure, I’ll check it out.

[vinothkumarr227]

@vinothkumarr227 there is a failure in the updated test reported by codecov: https://github.com/grpc/grpc-go/actions/runs/16616024027/job/47008766111?pr=8342

PTAL and ensure the test is not flaky. Hi @arjan-bal , I tested the test locally and everything passed consistently. I’ve now merged the latest changes from master, and all test cases are passing.