Prevent the usage of xfail in tests files

[cbeauchesne]

Motivation

system-tests offers a semantics way to mark expected failure. In #7408, we plan to prevent the usage of bare @xfail marker, so we need to prevent the usage of it elsewhere in the code.

Changes

Change the skip logic for cassette generation.

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:

tests/ai_guard/conftest.py                                              @DataDog/k9-ai-guard @DataDog/system-tests-core
tests/integration_frameworks/conftest.py                                @DataDog/system-tests-core
tests/parametric/test_llm_observability/conftest.py                     @DataDog/ml-observability @DataDog/system-tests-core

[chatgpt-codex-connector]

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[cbeauchesne]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. 👍

Reviewed commit: 05d3d8e109

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[datadog-datadog-prod-us1-2]

🎉 All green!

🧪 All tests passed
❄️ No new flaky tests detected

🔄 Datadog auto-retried 65 jobs - 65 passed on retry

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