chore(internal): migrate AgentResponse class to native

[brettlangdon]

Description

Separated from #17626

Testing

Risks

Additional Notes

[cit-pr-commenter-54b7da]

Codeowners resolved as

src/native/data_pipeline/agent_response.rs                              @DataDog/apm-core-python

[chatgpt-codex-connector]

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Reviewed commit: 9c473732a0

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[pr-commenter]

Benchmarks

Benchmark execution time: 2026-05-20 16:14:11

Comparing candidate commit dcf5812 in PR branch brettlangdon/native.agent.response with baseline commit 71279ab in branch main.

Found 0 performance improvements and 5 performance regressions! Performance is the same for 599 metrics, 10 unstable metrics.

scenario:iastaspects-index_aspect

• 🟥 execution_time [+9.508µs; +12.615µs] or [+7.800%; +10.349%]

scenario:iastaspects-stringio_aspect

• 🟥 execution_time [+527.650µs; +584.627µs] or [+13.764%; +15.251%]

scenario:iastaspectsospath-ospathbasename_aspect

• 🟥 execution_time [+84.095µs; +99.474µs] or [+20.096%; +23.771%]

scenario:span-start

• 🟥 execution_time [+1.390ms; +1.547ms] or [+8.903%; +9.907%]

scenario:tracer-small

• 🟥 execution_time [+26.551µs; +28.466µs] or [+7.882%; +8.451%]

[datadog-official]

🎉 All green!

🧪 All tests passed
❄️ No new flaky tests detected

_{This comment will be updated automatically if new data arrives.
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