Remove k8s and tunnel features

qa/qa/page/project/infrastructure/kubernetes/add_existing.rb

@@ -20,7 +20,7 @@ module QA
             end
 
             def set_api_url(api_url)
-              fill_in 'cluster_platform_kubernetes_attributes_api_url', with: QA::Runtime::Env.cluster_api_url || api_url
+              fill_in 'cluster_platform_kubernetes_attributes_api_url', with: api_url
             end
 
             def set_ca_certificate(ca_certificate)

qa/qa/runtime/env.rb

@@ -93,10 +93,6 @@ module QA
         ENV['CI'] || ENV['CI_SERVER']
       end
 
-      def cluster_api_url
-        ENV['CLUSTER_API_URL']
-      end
-
       def qa_cookies
         ENV['QA_COOKIES'] && ENV['QA_COOKIES'].split(';')
       end

qa/qa/scenario/test/integration/kubernetes.rb

-# frozen_string_literal: true
-
-module QA
-  module Scenario
-    module Test
-      module Integration
-        class Kubernetes < Test::Instance::All
-          tags :kubernetes
-        end
-      end
-    end
-  end
-end

qa/qa/scenario/test/integration/ssh_tunnel.rb

-# frozen_string_literal: true
-
-module QA
-  module Scenario
-    module Test
-      module Integration
-        class SSHTunnel < Test::Instance::All
-          tags :ssh_tunnel
-        end
-      end
-    end
-  end
-end