Remove cluster from Project model

app/models/project.rb

@@ -189,7 +189,6 @@ class Project < ActiveRecord::Base
   has_one :statistics, class_name: 'ProjectStatistics'
 
   has_one :cluster_project, class_name: 'Clusters::Project'
-  has_one :cluster, through: :cluster_project, class_name: 'Clusters::Cluster'
   has_many :clusters, through: :cluster_project, class_name: 'Clusters::Cluster'
 
   # Container repositories need to remove data from the container registry,

spec/models/project_spec.rb

@@ -78,7 +78,7 @@ describe Project do
     it { is_expected.to have_many(:uploads).dependent(:destroy) }
     it { is_expected.to have_many(:pipeline_schedules) }
     it { is_expected.to have_many(:members_and_requesters) }
-    it { is_expected.to have_one(:cluster) }
+    it { is_expected.to have_many(:clusters) }
     it { is_expected.to have_many(:custom_attributes).class_name('ProjectCustomAttribute') }
 
     context 'after initialized' do