Add codeowners for the smoke test

Author: manuel-alvarez-alvarez

.github/CODEOWNERS

@@ -142,6 +142,7 @@ dd-trace-core/src/test/groovy/datadog/trace/llmobs/  @DataDog/ml-observability
 
 # @DataDog/feature-flagging-and-experimentation-sdk
 /dd-java-agent/agent-featureflag/                           @DataDog/feature-flagging-and-experimentation-sdk
+/dd-smoke-tests/featureflag/                                @DataDog/feature-flagging-and-experimentation-sdk
 /internal-api/src/main/java/datadog/trace/api/featureflag   @DataDog/feature-flagging-and-experimentation-sdk
 /internal-api/src/test/groovy/datadog/trace/api/featureflag @DataDog/feature-flagging-and-experimentation-sdk
 /products/openfeature/                                      @DataDog/feature-flagging-and-experimentation-sdk