EE : Update method signatures which changed in CE

To recap: we want to be able to pass in group: group in the future.

ee/app/services/ee/clusters/create_service.rb

@@ -4,7 +4,7 @@ module EE
       extend ::Gitlab::Utils::Override
 
       override :can_create_cluster?
-      def can_create_cluster?
+      def can_create_cluster?(project)
         super || project.feature_available?(:multiple_clusters)
       end
     end

ee/spec/services/ee/clusters/create_service_spec.rb

@@ -6,7 +6,7 @@ describe Clusters::CreateService do
   let(:user) { create(:user) }
   let!(:cluster) { create(:cluster, :provided_by_gcp, :production_environment, projects: [project]) }
 
-  subject { described_class.new(project, user, params).execute(access_token) }
+  subject { described_class.new(user, params).execute(project: project, access_token: access_token) }
 
   before do
     allow(project).to receive(:feature_available?).and_call_original