parametric: Add additional test cases for metrics-specific OTEL_EXPORTER_OTLP_METRICS_PROTOCOL

[zacharycmontoya]

Motivation

The OTLP exporter accepts general configurations that apply to all signals (traces, metrics, logs) and it also accepts signal-specific configurations. We want to test both for configurations we recognize.

Changes

Adds two test cases to assert that OTEL_EXPORTER_OTLP_METRICS_PROTOCOL is respected, inside the Test_Otel_Metrics_Configuration_OTLP_Exporter_Metrics_Protocol test class.

Workflow

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   • 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

• If PR title starts with [<language>], double-check that only <language> is impacted by the change
• No system-tests internal is modified. Otherwise, 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 (or removed)?
  • Get a review from R&P team

[github-actions]

CODEOWNERS have been resolved as:

tests/parametric/test_otel_metrics.py                                   @DataDog/system-tests-core @DataDog/apm-sdk-capabilities