google.golang.org/grpc/otelgrpc: Use canonical string status codes

[haines]

Fixes #8543

[dmathieu]

This will need a changelog entry.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.2%. Comparing base (8096a3e) to head (00d0d0c).
⚠️ Report is 100 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #8565   +/-   ##
=====================================
  Coverage   82.1%   82.2%           
=====================================
  Files        179     179           
  Lines      13662   13700   +38     
=====================================
+ Hits       11227   11265   +38     
  Misses      2033    2033           
  Partials     402     402           

Files with missing lines	Coverage Δ
...n/google.golang.org/grpc/otelgrpc/stats_handler.go	98.6% <100.0%> (+0.2%)	⬆️

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[pellared]

There is also a failure from the linter

[bincyber]

Should not this be spelled the same way as grpc_codes.Canceled? @haines

[dmathieu]

The string representation of this error does have two L in the grpc spec.

https://github.com/grpc/grpc/blob/v1.75.0/doc/statuscodes.md

[haines]

And this is what is used as the canonical string internally in the Go gRPC implementation as well, unfortunately they named the constant using the alternate spelling which makes things confusing: https://github.com/grpc/grpc-go/blob/b71c26202050d6a6c528e42f96a2712baa74eb61/codes/code_string.go#L77