Propagate session_id via env

[bwoebi]

Fix sending reference args to non-by-ref args and actually run exec integration in CI.

[chatgpt-codex-connector]

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Reviewed commit: bd9ad22312

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[datadog-official]

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 60.64% (-0.06%)

_{This comment will be updated automatically if new data arrives.
🔗 Commit SHA: 6d71144 | Docs | Datadog PR Page | Give us feedback!}

[pr-commenter]

Benchmarks [ tracer ]

Benchmark execution time: 2026-04-28 12:42:31

Comparing candidate commit 6d71144 in PR branch bob/session_id_propagation with baseline commit 919c36a in branch master.

Found 1 performance improvements and 1 performance regressions! Performance is the same for 192 metrics, 0 unstable metrics.

scenario:MessagePackSerializationBench/benchMessagePackSerialization-opcache

• 🟩 execution_time [-8.199µs; -6.521µs] or [-7.295%; -5.801%]

scenario:SamplingRuleMatchingBench/benchRegexMatching3-opcache

• 🟥 execution_time [+244.536ns; +448.864ns] or [+2.108%; +3.870%]