Remove UnaryServerInterceptor

[nirdosh17]

Closes #7106

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: nirdosh17 / name: Nirdosh Gautam (ea81ec6, fea29d7, c276693, cf68962, f69fb98, 7774b1b)
• ✅ login: dmathieu / name: Damien Mathieu (b169f53)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.8%. Comparing base (47721e8) to head (b169f53).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #7115     +/-   ##
=======================================
- Coverage   75.8%   75.8%   -0.1%     
=======================================
  Files        207     207             
  Lines      19478   19412     -66     
=======================================
- Hits       14783   14726     -57     
+ Misses      4259    4253      -6     
+ Partials     436     433      -3     

Files with missing lines	Coverage Δ
...ion/google.golang.org/grpc/otelgrpc/interceptor.go	88.0% <100.0%> (-0.6%)	⬇️

... and 1 file with indirect coverage changes

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[miparnisari]

I'm a consumer of OTEL and the migration path from UnaryServerInterceptor to NewServerHandler doesn't look trivial - the signatures are very different. A short migration guide would be super helpful!

[pellared]

Check the examples from https://pkg.go.dev/go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc

[miparnisari]

@pellared those examples aren't helpful. We have custom code around grpc.UnaryServerInterceptor and the new OTEL library doesn't fit that 😭