Add SAMPLING_RATE_CAPPING scenario to CI

[nccatoni]

Summary

• Add SAMPLING_RATE_CAPPING scenario to run-end-to-end.yml workflow and workflow_data.py scenario list
• Follow-up to Test sampling rate increase cap #6412 which added the scenario definition but missed CI integration

[github-actions]

CODEOWNERS have been resolved as:

.github/workflows/run-end-to-end.yml                                    @DataDog/system-tests-core
manifests/golang.yml                                                    @DataDog/dd-trace-go-guild
manifests/java.yml                                                      @DataDog/asm-java @DataDog/apm-java
utils/scripts/ci_orchestrators/workflow_data.py                         @DataDog/system-tests-core

[datadog-prod-us1-4]

✅ Tests

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

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