Put target projects calculation behind FF

We received performance regression when we introduced it
Let's put it behind the FF until we solve this problem

app/helpers/commits_helper.rb

@@ -135,6 +135,8 @@ module CommitsHelper
   end
 
   def cherry_pick_projects_data(project)
+    return [] unless Feature.enabled?(:pick_into_project, project, default_enabled: :yaml)
+
     target_projects(project).map do |project|
       {
         id: project.id.to_s,

spec/helpers/commits_helper_spec.rb

@@ -257,5 +257,15 @@ RSpec.describe CommitsHelper do
         { id: forked_project.id.to_s, name: forked_project.full_path, refsUrl: refs_project_path(forked_project) }
       ])
     end
+
+    context 'pick_into_project is disabled' do
+      before do
+        stub_feature_flags(pick_into_project: false)
+      end
+
+      it 'does not calculate target projects' do
+        expect(helper.cherry_pick_projects_data(project)).to eq([])
+      end
+    end
   end
 end