Adds system test that reports grpc status code in the stats

[bric3]

Motivation

The java agent didn't included the gRPC status code in the stats payload. It will do so in 1.61.0. So let's add a system test to verify that.

[github-actions]

CODEOWNERS have been resolved as:

tests/stats/test_stats.py                                               @DataDog/system-tests-core
utils/docker_fixtures/spec/trace.py                                     @DataDog/system-tests-core

[datadog-prod-us1-5]

✅ Tests

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Move library/version gating from decorators to manifests

This test deactivation logic is encoded in @missing_feature conditions that depend only on library version and weblog variant, but docs/edit/skip-tests.md explicitly requires those conditions to live in manifest files ("Always prefer manifest files" and "If your condition depends only on library name, library version, or weblog variant, use the manifest file instead", lines 3-13). Keeping this in decorators makes activation state harder to track and maintain (especially for automated manifest-based activation/deactivation workflows), which can leave this test silently skipped longer than intended as versions evolve.

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