FFL-1273 Native feature flags evaluation

Rakefile

@@ -26,6 +26,7 @@ CORE_WITH_LIBDATADOG_API = [
   'spec/datadog/core/crashtracking/**/*_spec.rb',
   'spec/datadog/core/process_discovery_spec.rb',
   'spec/datadog/core/configuration/stable_config_spec.rb',
+  'spec/datadog/core/feature_flags_spec.rb',
   'spec/datadog/core/ddsketch_spec.rb',
   'spec/datadog/data_streams/**/*_spec.rb',
   'spec/datadog/open_feature_spec.rb',
@@ -92,7 +93,7 @@ namespace :spec do
   RSpec::Core::RakeTask.new(:main) do |t, args|
     t.pattern = 'spec/**/*_spec.rb'
     t.exclude_pattern = 'spec/**/{appsec/integration,contrib,benchmark,redis,auto_instrument,opentelemetry,open_feature,profiling,crashtracking,error_tracking,rubocop,data_streams}/**/*_spec.rb,' \
-                        ' spec/**/{auto_instrument,opentelemetry,process_discovery,stable_config,ddsketch,open_feature}_spec.rb,' \
+                        ' spec/**/{auto_instrument,opentelemetry,process_discovery,stable_config,ddsketch,open_feature,feature_flags}_spec.rb,' \
                         ' spec/datadog/gem_packaging_spec.rb'
     t.rspec_opts = args.to_a.join(' ')
   end