EE: Removes specs for clusters_cte FF

ee/spec/models/concerns/ee/deployment_platform_spec.rb

 require 'rails_helper'
 
 describe EE::DeploymentPlatform do
-  shared_examples '#deployment_platform' do
+  describe '#deployment_platform' do
     let(:group) { create(:group) }
     let(:project) { create(:project, group: group) }
 
@@ -265,20 +265,4 @@ describe EE::DeploymentPlatform do
       end
     end
   end
-
-  context 'legacy implementation' do
-    before do
-      stub_feature_flags(clusters_cte: false)
-    end
-
-    include_examples '#deployment_platform'
-  end
-
-  context 'CTE implementation' do
-    before do
-      stub_feature_flags(clusters_cte: true)
-    end
-
-    include_examples '#deployment_platform'
-  end
 end