ci: add nightly system-tests workflow

[nccatoni]

Description

Adds a nightly workflow (system-tests-nightly.yml) that runs the official system-tests reusable workflow daily at 4 AM GMT. It uses _system_tests_dev_mode to build from the latest commit on the default branch, runs the tracer-release scenarios group, and pushes results to Test Optimization.

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

Reviewer checklist

• This is a CI-only change (new scheduled workflow), no code changes.
• Appropriate labels assigned.

[datadog-official]

⚠️ Tests

✨ Fix all issues with BitsAI or with Cursor

⚠️ Warnings

❄️ 1 New flaky test detected

ext/pcre/tests/bug72685.phpt (Bug #72685: Same string is UTF-8 validated repeatedly) from PHP.ext.pcre.tests (Datadog) (Fix with Cursor)

001+ bool(false)
001- bool(true)

🧪 1065 Tests failed

    ❄️ Known flaky: testCommandWithArgument from cakephp-28-test.DDTrace\Tests\Integrations\CLI\CakePHP\V2_8\CommonScenariosTest (Fix with Cursor)

    ❄️ Known flaky: testCommandWithNoArguments from cakephp-28-test.DDTrace\Tests\Integrations\CLI\CakePHP\V2_8\CommonScenariosTest (Fix with Cursor)

❄️ Known flaky: testCommandWithArgument from cakephp-310-test.DDTrace\Tests\Integrations\CLI\CakePHP\V3_10\CommonScenariosTest (Datadog) (Fix with Cursor)

DDTrace\Tests\Integrations\CLI\CakePHP\V3_10\CommonScenariosTest::testCommandWithArgument
TypeError: Argument 1 passed to DDTrace\Tests\Common\SpanChecker::DDTrace\Tests\Common\{closure}() must be of the type array, string given

tests/Common/SpanChecker.php:599
tests/Common/SpanChecker.php:601
tests/Common/SpanChecker.php:346
tests/Common/SpanAssertionTrait.php:19
tests/Common/IntegrationTestCase.php:197
tests/Integrations/CLI/CakePHP/V3_10/CommonScenariosTest.php:51
tests/Common/RetryTraitVersionGeneric.php:28
...

View all

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 62.11%. Comparing base (a9caaa0) to head (4af9b76).
⚠️ Report is 1 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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