[Java] Update OTLP Trace Metrics Tests for Java

[mhlidd]

Motivation

Java does not support http/json, so system-tests need to switch to protobuf for Java. With that, this PR introduces normalization between protobuf and http/json formats (snake vs camel case). Additionally, this PR tweaks some details to fit w/ the Java implementation and enables the Java tests.

Changes

Workflow

1. ⚠️ Create your PR as draft ⚠️
2. Work on you PR until the CI passes
3. Mark it as ready for review
   • Test logic is modified? -> Get a review from RFC owner.
   • Framework is modified, or non obvious usage of it -> get a review from R&P team

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Reviewer checklist

• Anything but tests/ or manifests/ is modified ? I have the approval from R&P team
• A docker base image is modified?
  • the relevant build-XXX-image label is present
• A scenario is added, removed or renamed?
  • Get a review from R&P team

[github-actions]

CODEOWNERS have been resolved as:

manifests/java.yml                                                      @DataDog/asm-java @DataDog/apm-java
tests/parametric/test_otlp_trace_metrics.py                             @DataDog/system-tests-core @DataDog/apm-sdk-capabilities

[datadog-prod-us1-4]

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