Remove duplicate clusterable presenter method

The method already existed under a different name

app/presenters/clusterable_presenter.rb

@@ -52,10 +52,6 @@ class ClusterablePresenter < Gitlab::View::Presenter::Delegated
     raise NotImplementedError
   end
 
-  def clusters_path(params = {})
-    raise NotImplementedError
-  end
-
   def empty_state_help_text
     nil
   end

app/presenters/group_clusterable_presenter.rb

@@ -24,11 +24,6 @@ class GroupClusterablePresenter < ClusterablePresenter
     group_cluster_path(clusterable, cluster, params)
   end
 
-  override :clusters_path
-  def clusters_path(params = {})
-    group_clusters_path(clusterable, params)
-  end
-
   override :empty_state_help_text
   def empty_state_help_text
     s_('ClusterIntegration|Adding an integration to your group will share the cluster across all your projects.')

app/presenters/instance_clusterable_presenter.rb

@@ -67,3 +67,5 @@ class InstanceClusterablePresenter < ClusterablePresenter
     link_to(s_('ClusterIntegration|Learn more about instance Kubernetes clusters'), help_page_path('user/instance/clusters/index'), target: '_blank', rel: 'noopener noreferrer')
   end
 end
+
+InstanceClusterablePresenter.prepend EE::InstanceClusterablePresenter

app/presenters/project_clusterable_presenter.rb

@@ -24,11 +24,6 @@ class ProjectClusterablePresenter < ClusterablePresenter
     project_cluster_path(clusterable, cluster, params)
   end
 
-  override :clusters_path
-  def clusters_path(params = {})
-    project_clusters_path(clusterable, params)
-  end
-
   override :sidebar_text
   def sidebar_text
     s_('ClusterIntegration|With a Kubernetes cluster associated to this project, you can use review apps, deploy your applications, run your pipelines, and much more in an easy way.')

ee/app/helpers/ee/clusters_helper.rb

@@ -15,7 +15,7 @@ module EE
 
     def cluster_health_data(cluster)
       {
-        'clusters-path': clusterable.clusters_path,
+        'clusters-path': clusterable.index_path,
         'metrics-endpoint': clusterable.metrics_cluster_path(cluster, format: :json),
         'documentation-path': help_page_path('administration/monitoring/prometheus/index.md'),
         'empty-getting-started-svg-path': image_path('illustrations/monitoring/getting_started.svg'),

ee/app/presenters/ee/instance_clusterable_presenter.rb

+# frozen_string_literal: true
+
+module EE
+  module InstanceClusterablePresenter
+    extend ::Gitlab::Utils::Override
+
+    override :metrics_cluster_path
+    def metrics_cluster_path(cluster, params = {})
+      metrics_admin_cluster_path(cluster, params)
+    end
+  end
+end

ee/spec/helpers/ee/clusters_helper_spec.rb

@@ -76,7 +76,7 @@ describe ClustersHelper do
 
       it do
         is_expected.to match(
-          'clusters-path': clusterable_presenter.clusters_path,
+          'clusters-path': clusterable_presenter.index_path,
           'metrics-endpoint': clusterable_presenter.metrics_cluster_path(cluster, format: :json),
           'documentation-path': help_page_path('administration/monitoring/prometheus/index.md'),
           'empty-getting-started-svg-path': match_asset_path('/assets/illustrations/monitoring/getting_started.svg'),

ee/spec/presenters/ee/instance_clusterable_presenter_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe InstanceClusterablePresenter do
+  include Gitlab::Routing.url_helpers
+
+  let(:presenter) { described_class.new(instance) }
+  let(:cluster) { create(:cluster, :provided_by_gcp, :instance) }
+  let(:instance) { cluster.instance }
+
+  describe '#metrics_cluster_path' do
+    subject { presenter.metrics_cluster_path(cluster) }
+
+    it { is_expected.to eq(metrics_admin_cluster_path(cluster)) }
+  end
+end

spec/presenters/group_clusterable_presenter_spec.rb

@@ -82,10 +82,4 @@ describe GroupClusterablePresenter do
 
     it { is_expected.to eq(group_cluster_path(group, cluster)) }
   end
-
-  describe '#clusters_path' do
-    subject { presenter.clusters_path }
-
-    it { is_expected.to eq(group_clusters_path(group)) }
-  end
 end

spec/presenters/project_clusterable_presenter_spec.rb

@@ -82,10 +82,4 @@ describe ProjectClusterablePresenter do
 
     it { is_expected.to eq(project_cluster_path(project, cluster)) }
   end
-
-  describe '#clusters_path' do
-    subject { presenter.clusters_path }
-
-    it { is_expected.to eq(project_clusters_path(project)) }
-  end
 end