Enable merged OTLP trace metrics coverage

[mabdinur]

Motivation

The five tracer implementations are merged, so OTLP trace metrics can be treated as GA at their next release boundary. Older tracer versions skip the file as a whole.

Changes

• Set one file-level minimum version per tracer: Go v2.11.0-dev, Java v1.66.0-SNAPSHOT, .NET v3.52.0, Node.js v6.11.0, and Python v4.14.0-dev.
• Remove redundant method-level version declarations and an unreachable Node.js compatibility condition.
• Keep only genuine exceptions, including peer tags, disabled APM tracing, unsupported optional tags, and Node.js service-entry child aggregation.

Implementation PRs: Go #5155, Java #12144, .NET #8992, Node.js #9685, and Python #19672 backed by libdatadog #2316.

Validated with yamlfmt, yamllint, manifest parsing, and GA-boundary declaration checks.

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

🚀 Once your PR is reviewed and the CI green, you can merge it!

🛟 #apm-shared-testing 🛟

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/dotnet.yml                                                    @DataDog/apm-dotnet @DataDog/asm-dotnet
manifests/golang.yml                                                    @DataDog/dd-trace-go-guild
manifests/java.yml                                                      @DataDog/asm-java @DataDog/apm-java
manifests/nodejs.yml                                                    @DataDog/dd-trace-js
manifests/python.yml                                                    @DataDog/apm-python @DataDog/asm-python

[datadog-prod-us1-3]

🎉 All green!

🧪 All tests passed
❄️ No new flaky tests detected

_{This comment will be updated automatically if new data arrives.
🔗 Commit SHA: 60b4125 | Docs | View more details | Give us feedback!}

[mabdinur]

@mhlidd CI is green and this is ready for review