DI: report evaluation errors

[p-datadog]

What does this PR do?

Reports expression evaluation errors in the payload when building the message from template segments

Motivation:
Implementation of expression language for DI

Change log entry
Yes: dynamic instrumentation: report evaluation errors to the UI

Additional Notes:

How to test the change?

Tests are included

[datadog-datadog-prod-us1]

✅ Tests

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

🎯 Code Coverage
• Patch Coverage: 90.91%
• Total Coverage: 95.19% (-0.01%)

View detailed report

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[pr-commenter]

Benchmarks

Benchmark execution time: 2025-09-24 17:51:42

Comparing candidate commit 96c9fb1 in PR branch di-eval-errors with baseline commit 9b2f922 in branch master.

Found 6 performance improvements and 0 performance regressions! Performance is the same for 38 metrics, 2 unstable metrics.

scenario:profiling - intern_all 1000 repeated strings

• 🟩 throughput [+1398.081op/s; +1462.128op/s] or [+6.155%; +6.437%]

scenario:tracing - 1 span trace - no writer

• 🟩 throughput [+614.719op/s; +657.919op/s] or [+5.210%; +5.576%]

scenario:tracing - 10 span trace - no writer

• 🟩 throughput [+142.975op/s; +149.961op/s] or [+5.650%; +5.926%]

scenario:tracing - 100 span trace - no writer

• 🟩 throughput [+19.986op/s; +20.734op/s] or [+6.638%; +6.887%]

scenario:tracing - Propagation - Datadog

• 🟩 throughput [+3707.046op/s; +3788.827op/s] or [+12.791%; +13.073%]

scenario:tracing - Tracing.log_correlation

• 🟩 throughput [+11310.964op/s; +11629.491op/s] or [+11.226%; +11.542%]