Rename unify_circuit project association to integration

Renames project association from unify_circuit_service to
unify_circuit_integration.

app/models/integration.rb

@@ -54,6 +54,7 @@ class Integration < ApplicationRecord
     redmine
     slack slack_slash_commands
     teamcity
+    unify_circuit
   ].to_set.freeze
 
   def self.renamed?(name)

app/models/project.rb

@@ -188,7 +188,7 @@ class Project < ApplicationRecord
   has_one :slack_integration, class_name: 'Integrations::Slack'
   has_one :slack_slash_commands_integration, class_name: 'Integrations::SlackSlashCommands'
   has_one :teamcity_integration, class_name: 'Integrations::Teamcity'
-  has_one :unify_circuit_service, class_name: 'Integrations::UnifyCircuit'
+  has_one :unify_circuit_integration, class_name: 'Integrations::UnifyCircuit'
   has_one :webex_teams_service, class_name: 'Integrations::WebexTeams'
   has_one :youtrack_service, class_name: 'Integrations::Youtrack'
 

spec/lib/gitlab/import_export/all_models.yml

@@ -381,7 +381,7 @@ project:
 - microsoft_teams_integration
 - mattermost_integration
 - hangouts_chat_integration
-- unify_circuit_service
+- unify_circuit_integration
 - buildkite_integration
 - bamboo_integration
 - teamcity_integration

spec/models/project_spec.rb

@@ -39,7 +39,7 @@ RSpec.describe Project, factory_default: :keep do
     it { is_expected.to have_one(:microsoft_teams_integration) }
     it { is_expected.to have_one(:mattermost_integration) }
     it { is_expected.to have_one(:hangouts_chat_integration) }
-    it { is_expected.to have_one(:unify_circuit_service) }
+    it { is_expected.to have_one(:unify_circuit_integration) }
     it { is_expected.to have_one(:webex_teams_service) }
     it { is_expected.to have_one(:packagist_integration) }
     it { is_expected.to have_one(:pushover_integration) }