Use canonical FFE fixtures

[leoromanovsky]

Motivation

Make DataDog/ffe-system-test-data the canonical source for FFE/OpenFeature JSON fixtures in dd-trace-java. This removes copied smoke-test fixtures and moves evaluator behavior coverage to the shared corpus. Depends on DataDog/ffe-system-test-data#9.

Changes

• Add dd-smoke-tests/openfeature/src/test/resources/ffe-system-test-data as a git submodule pinned to the canonical fixture update.
• Remove copied OpenFeature fixture JSON resources.
• Update the smoke test to load canonical ufc-config.json and all sorted evaluation-cases/*.json files.
• Assert canonical result values and reasons from the JSON corpus.
• Remove the stale programmatic evaluator fixture set in favor of the canonical JSON-driven loop.
• Fix the OpenFeature smoke CodeNarc violation by removing an unnecessary Groovy import.
• Add weekly Dependabot gitsubmodule updates.

📖 https://datadoghq.atlassian.net/wiki/spaces/PANA/pages/6713639211/FFE+SDK+Fixture+Contribution+Guide

Decisions

• Shared evaluator behavior must come from JSON fixtures in ffe-system-test-data, not programmatic or copied fixture sets.
• dd-trace-java already supports submodules and recursive checkout in CI; this PR uses the same pattern for the OpenFeature fixture corpus.
• PHP is intentionally excluded until its OpenFeature client lands.

Validation

• JAVA_HOME=/opt/homebrew/opt/openjdk@17/libexec/openjdk.jdk/Contents/Home PATH=/opt/homebrew/opt/openjdk@17/bin:$PATH ./gradlew :dd-smoke-tests:openfeature:codenarcTest
• JAVA_HOME=/opt/homebrew/opt/openjdk@17/libexec/openjdk.jdk/Contents/Home PATH=/opt/homebrew/opt/openjdk@17/bin:$PATH ./gradlew :products:feature-flagging:feature-flagging-api:test --tests datadog.trace.api.openfeature.DDEvaluatorTest

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[chatgpt-codex-connector]

Restore missing-flag error reporting

When a configured provider is asked for a flag key that is absent from config.flags, this now returns a normal DEFAULT evaluation with no FLAG_NOT_FOUND error. In that scenario OpenFeature callers and the existing FlagEvalHook metrics path will report the lookup as a successful default rather than a missing-flag error, so dashboards/alerts that depend on error.type=flag_not_found stop seeing these failures. If the intent is only to return the supplied default value, keep that value but preserve the error reason/code for absent flags.

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