Log a warning if OTLP endpoint port is likely incorrect given the protocol

[jack-berg]

The OpenTelemetry java agent switched the default OTLP protocol from grpc to http/protobuf in the 2.0 release. This is misaligned with the autoconfigure default, which is stuck with the protocol being grpc until a major version bump, which there are no plans for.

This causes confusion for users.

To relieve some of the confusion, this PR adds logging when the the endpoint port is not aligned with version of the protocol. I.e. log when port is 4318 and protocol is grpc, or when port is 43117 and protocol is http/protobuf.

Thanks to @laurit for the recommendation.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.37%. Comparing base (628db61) to head (86b41c9).
Report is 3 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6813      +/-   ##
============================================
- Coverage     90.37%   90.37%   -0.01%     
- Complexity     6577     6584       +7     
============================================
  Files           731      731              
  Lines         19714    19722       +8     
  Branches       1926     1931       +5     
============================================
+ Hits          17817    17824       +7     
  Misses         1300     1300              
- Partials        597      598       +1     

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