test(go): enable otlp trace metric tests

[rachelyangdog]

Motivation

Changes

Enable otlp trace metric tests for go.

Workflow

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   • Test logic is modified? -> Get a review from RFC owner.
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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/golang.yml                                                    @DataDog/dd-trace-go-guild

[chatgpt-codex-connector]

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Reviewed commit: a131f9396f

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[datadog-datadog-prod-us1]

🎉 All green!

🧪 All tests passed
❄️ No new flaky tests detected

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