Enable EVP flagevaluation system tests for Ruby

[leoromanovsky]

Motivation

Ruby needs the shared server-side EVP flagevaluation system-test contract enabled so APM reviewers can validate that Ruby evaluations produce the same backend-visible signal as the other SDKs. This PR provides the public system-tests companion for the Ruby SDK fanout.

Changes

• Enables tests/ffe/test_flag_eval_evp.py for the validated Ruby rails72 weblog in manifests/ruby.yml at v2.36.0-dev; other Ruby weblogs remain irrelevant.
• Splits and parallelizes the degradation test requests for Ruby so the test proves SDK aggregation without relying on one oversized app request.
• Keeps the EVP path constant aligned with the current merged system-tests contract.

Decisions

• Enable only rails72 for EVP flagevaluation; broader non-metric OpenFeature evaluation coverage for older Ruby weblogs lives in the separate Ruby-oldest PR.
• Keep degradation request shaping in the system test because app request body/time limits are separate from the SDK EVP payload-splitting behavior under review.
• Existing OTel metric coverage stays in tests/ffe/test_flag_eval_metrics.py; this PR is only for EVP flagevaluation.

Validation Evidence

System Tests

• Companion SDK PR: feat(open_feature): emit server-side EVP flagevaluation dd-trace-rb#5896
• Companion Ruby-oldest system-tests PR: Enable Ruby OpenFeature evaluation on older weblogs #7199
• This PR enables the Ruby EVP flagevaluation system-test manifest surface used by the SDK PR.

[github-actions]

CODEOWNERS have been resolved as:

manifests/ruby.yml                                                      @DataDog/ruby-guild @DataDog/asm-ruby
tests/ffe/test_flag_eval_evp.py                                         @DataDog/feature-flagging-and-experimentation-sdk @DataDog/system-tests-core

[datadog-prod-us1-4]

 

✨ Fix all issues with BitsAI

⚠️ Warnings

🚦 4 Pipeline jobs failed

Testing the test | System Tests (python, dev) / End-to-end #1 / uwsgi-poc 1     

🧪 2 Tests failed

tests.appsec.iast.sink.test_unvalidated_redirect.TestUnvalidatedHeader.test_secure[uwsgi-poc] from system_tests_suite  

ValueError: Unexpected vulnerability reported: UNVALIDATED_REDIRECT

self = <tests.appsec.iast.sink.test_unvalidated_redirect.TestUnvalidatedHeader object at 0x7fc54186b9b0>

    def test_secure(self):
>       return super().test_secure()

tests/appsec/iast/sink/test_unvalidated_redirect.py:62: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
tests/appsec/iast/utils.py:186: in test_secure
...

tests.appsec.iast.sink.test_unvalidated_redirect.TestUnvalidatedRedirect.test_secure[uwsgi-poc] from system_tests_suite  

ValueError: Unexpected vulnerability reported: UNVALIDATED_REDIRECT

self = <tests.appsec.iast.sink.test_unvalidated_redirect.TestUnvalidatedRedirect object at 0x7fc54186bd40>

    def test_secure(self):
>       super().test_secure()

tests/appsec/iast/sink/test_unvalidated_redirect.py:47: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
tests/appsec/iast/utils.py:186: in test_secure
...

Testing the test | System Tests (ruby, dev) / End-to-end #1 / rails72 1     

🧪 1 Test failed

pytest.internal[rails72] from system_tests_suite  

internal error

Traceback (most recent call last):
  File "/home/runner/work/system-tests/system-tests/venv/lib/python3.12/site-packages/_pytest/main.py", line 268, in wrap_session
    session.exitstatus = doit(config, session) or 0
                         ^^^^^^^^^^^^^^^^^^^^^
  File "/home/runner/work/system-tests/system-tests/venv/lib/python3.12/site-packages/_pytest/main.py", line 321, in _main
    config.hook.pytest_collection(session=session)
  File "/home/runner/work/system-tests/system-tests/venv/lib/python3.12/site-packages/pluggy/_hooks.py", line 265, in __call__
    return self._hookexec(self.name, self.get_hookimpls(), kwargs, firstresult)
...

Testing the test | System Tests (ruby, prod) / End-to-end #1 / rails72 1     

🧪 1 Test failed

pytest.internal[rails72] from system_tests_suite  

internal error

Traceback (most recent call last):
  File "/home/runner/work/system-tests/system-tests/venv/lib/python3.12/site-packages/_pytest/main.py", line 268, in wrap_session
    session.exitstatus = doit(config, session) or 0
                         ^^^^^^^^^^^^^^^^^^^^^
  File "/home/runner/work/system-tests/system-tests/venv/lib/python3.12/site-packages/_pytest/main.py", line 321, in _main
    config.hook.pytest_collection(session=session)
  File "/home/runner/work/system-tests/system-tests/venv/lib/python3.12/site-packages/pluggy/_hooks.py", line 265, in __call__
    return self._hookexec(self.name, self.get_hookimpls(), kwargs, firstresult)
...

View all 4 failed jobs.

ℹ️ Info

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❄️ No new flaky tests detected

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⚠️ Warnings

🚦 2 Pipeline jobs failed

Testing the test | System Tests (ruby, dev) / End-to-end #1 / rails72 1     

Testing the test | all-jobs-are-green     

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