Use feature flag default yaml for increment_counter

  - Use default_enabled: true for increment_counter
  usage data API
  - This allows to have events tracked using Redis with
  usage data API in self-managed

lib/api/helpers.rb

@@ -561,7 +561,7 @@ module API
 
     def increment_counter(event_name)
       feature_name = "usage_data_#{event_name}"
-      return unless Feature.enabled?(feature_name)
+      return unless Feature.enabled?(feature_name, default_enabled: :yaml)
 
       Gitlab::UsageDataCounters.count(event_name)
     rescue StandardError => error

spec/requests/api/usage_data_spec.rb

@@ -86,6 +86,7 @@ RSpec.describe API::UsageData do
       context 'with unknown event' do
         before do
           skip_feature_flags_yaml_validation
+          skip_default_enabled_yaml_check
         end
 
         it 'returns status ok' do