Guard extend_reactivate_trial_button_data method with feature flag

ee/spec/helpers/ee/trial_helper_spec.rb

@@ -227,6 +227,15 @@ RSpec.describe EE::TrialHelper do
       allow(namespace).to receive(:actual_plan_name).and_return('ultimate')
     end
 
+    context 'when feature flag is disabled' do
+      it { is_expected.to eq({ namespace_id: 1, plan_name: 'Ultimate', action: nil })}
+    end
+
+    context 'when feature flag is enabled' do
+      before do
+        stub_feature_flags(allow_extend_reactivate_trial: true)
+      end
+
       context 'when trial can be extended' do
         before do
           allow(namespace).to receive(:can_extend_trial?).and_return(true)
@@ -243,4 +252,5 @@ RSpec.describe EE::TrialHelper do
         it { is_expected.to eq({ namespace_id: 1, plan_name: 'Ultimate', action: 'reactivate' }) }
       end
     end
+  end
 end