[python] enable passing OTLP ot.th/ot.rv tracestate sampling scenarios

[vpellan]

Motivation

Enables the Python entries that pass against dd-trace-py's OTLP implementation (DataDog/dd-trace-py#19794), verified locally against a python@4.15.0-dev build across every impacted scenario

Changes

Flips tests/otel/test_tracing_otlp.py entries from missing_feature to v4.15.0-dev in manifests/python.yml:

• Test_Otlp_Carries_Ot
• Test_Otlp_Forwards_Inherited_Ot

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

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-04T14:48:14.532456Z	d4b07b6	PR opened

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review" or "@codex security review".

Codex reacts with 👀 while any review is running, comments if it has suggestions, and reacts with 👍 once all reviews finish with no findings.

[github-actions]

CODEOWNERS have been resolved as:

manifests/python.yml                                                    @DataDog/system-tests-reviewers

[datadog-datadog-prod-us1-2]

✅ All CI checks and tests passed.

🎉 All green!

🧪 All tests passed
❄️ No new flaky tests detected

_{This comment will be updated automatically if new data arrives.
🔗 Commit SHA: 91e8008 | Docs | View more details | Give us feedback!}