Fixes static analysis failures and broken specs

app/models/concerns/deployment_platform.rb

 module DeploymentPlatform
-  def deployment_platform
-    @deployment_platform ||= find_cluster_platform_kubernetes
-    @deployment_platform ||= find_kubernetes_service_integration
-    @deployment_platform ||= build_cluster_and_deployment_platform
+  def deployment_platform(environment: nil)
+    @deployment_platform ||=
+      find_cluster_platform_kubernetes ||
+      find_kubernetes_service_integration ||
+      build_cluster_and_deployment_platform
   end
 
   private

app/models/project.rb

@@ -915,11 +915,6 @@ class Project < ActiveRecord::Base
     @ci_service ||= ci_services.reorder(nil).find_by(active: true)
   end
 
-  def deployment_platform(environment: nil)
-    @deployment_platform ||= clusters.find_by(enabled: true)&.platform_kubernetes
-    @deployment_platform ||= services.where(category: :deployment).reorder(nil).find_by(active: true)
-  end
-
   def monitoring_services
     services.where(category: :monitoring)
   end

spec/models/project_spec.rb

@@ -3571,25 +3571,6 @@ describe Project do
     end
   end
 
-  describe '#deployment_platform' do
-    subject { project.deployment_platform }
-
-    let(:project) { create(:project) }
-
-    context 'when user configured kubernetes from Integration > Kubernetes' do
-      let!(:kubernetes_service) { create(:kubernetes_service, project: project) }
-
-      it { is_expected.to eq(kubernetes_service) }
-    end
-
-    context 'when user configured kubernetes from CI/CD > Clusters' do
-      let!(:cluster) { create(:cluster, :provided_by_gcp, projects: [project]) }
-      let(:platform_kubernetes) { cluster.platform_kubernetes }
-
-      it { is_expected.to eq(platform_kubernetes) }
-    end
-  end
-
   describe '#write_repository_config' do
     set(:project) { create(:project, :repository) }