ci: upload system-tests results to Test Optimization and add tracer-release nightly

[nccatoni]

Description

Two changes to the system-tests CI integration:

1. Upload all system-tests results to Test Optimization — adds an after_script to the .system_tests base job that copies JUnit XML files and uploads them via the existing silent-upload-junit-to-datadog.sh script.

2. Add tracer-release nightly scenarios — extends configure_system_tests to include the tracer-release scenario group when running on schedule or on master, using GitLab CI rules with variable overrides.

Follows the same pattern used in system-tests-dashboard nightly.

Reviewer checklist

• This is a CI-only change, no code changes.
• Appropriate labels assigned.

[datadog-official]

⚠️ Tests

✨ Fix all issues with BitsAI or with Cursor

⚠️ Warnings

🧪 1028 Tests failed

testSearchPhpBinaries from integration.DDTrace\Tests\Integration\PHPInstallerTest (Datadog) (Fix with Cursor)

DDTrace\Tests\Integration\PHPInstallerTest::testSearchPhpBinaries
Test code or tested code printed unexpected output: Searching for available php binaries, this operation might take a while.

testSimplePushAndProcess from laravel-58-test.DDTrace\Tests\Integrations\Laravel\V5_8\QueueTest (Datadog) (Fix with Cursor)

DDTrace\Tests\Integrations\Laravel\V5_8\QueueTest::testSimplePushAndProcess
Test code or tested code printed unexpected output: spanLinksTraceId: 69a0715a000000003a01fa7c6ce5b33a
tid: 69a0715a00000000
hexProcessTraceId: 3a01fa7c6ce5b33a
hexProcessSpanId: f36b5b336bc46f17
processTraceId: 4179897341486412602
processSpanId: 17540213450134023959

phpvfscomposer://tests/vendor/phpunit/phpunit/phpunit:106

testSimplePushAndProcess from laravel-8x-test.DDTrace\Tests\Integrations\Laravel\V8_x\QueueTest (Datadog) (Fix with Cursor)

DDTrace\Tests\Integrations\Laravel\V8_x\QueueTest::testSimplePushAndProcess
Test code or tested code printed unexpected output: spanLinksTraceId: 69a07f8f00000000bcc093c6a776d081
tid: 69a07f8f00000000
hexProcessTraceId: bcc093c6a776d081
hexProcessSpanId: 46254faa2639fc94
processTraceId: 13601033356081287297
processSpanId: 5054533748997618836

View all

ℹ️ Info

❄️ No new flaky tests detected

_{This comment will be updated automatically if new data arrives.
🔗 Commit SHA: 50f858b | Docs | Datadog PR Page | Was this helpful? React with 👍/👎 or give us feedback!}

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 62.11%. Comparing base (a9caaa0) to head (50f858b).
⚠️ Report is 7 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3660      +/-   ##
==========================================
- Coverage   62.21%   62.11%   -0.11%     
==========================================
  Files         141      141              
  Lines       13387    13387              
  Branches     1753     1753              
==========================================
- Hits         8329     8315      -14     
- Misses       4260     4273      +13     
- Partials      798      799       +1     

see 3 files with indirect coverage changes

---

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[pr-commenter]

Benchmarks [ tracer ]

Benchmark execution time: 2026-02-26 17:23:58

Comparing candidate commit 50f858b in PR branch add-nightly-system-tests with baseline commit a9caaa0 in branch master.

Found 2 performance improvements and 4 performance regressions! Performance is the same for 188 metrics, 0 unstable metrics.

scenario:MessagePackSerializationBench/benchMessagePackSerialization

• 🟩 execution_time [-7.788µs; -7.132µs] or [-7.270%; -6.657%]

scenario:MessagePackSerializationBench/benchMessagePackSerialization-opcache

• 🟩 execution_time [-6.832µs; -5.588µs] or [-6.144%; -5.025%]

scenario:SamplingRuleMatchingBench/benchRegexMatching1

• 🟥 execution_time [+114.047ns; +153.753ns] or [+9.980%; +13.455%]

scenario:SamplingRuleMatchingBench/benchRegexMatching2

• 🟥 execution_time [+96.248ns; +160.752ns] or [+8.364%; +13.970%]

scenario:SamplingRuleMatchingBench/benchRegexMatching3

• 🟥 execution_time [+85.931ns; +140.069ns] or [+7.386%; +12.039%]

scenario:SamplingRuleMatchingBench/benchRegexMatching4

• 🟥 execution_time [+88.585ns; +146.215ns] or [+7.612%; +12.565%]