Add repository storage move entity

lib/api/entities/project_repository_storage_move.rb

+# frozen_string_literal: true
+
+module API
+  module Entities
+    class ProjectRepositoryStorageMove < Grape::Entity
+      expose :id
+      expose :created_at
+      expose :human_state_name, as: :state
+      expose :source_storage_name
+      expose :destination_storage_name
+      expose :project, using: Entities::ProjectIdentity
+    end
+  end
+end

spec/lib/api/entities/project_repository_storage_move_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe API::Entities::ProjectRepositoryStorageMove do
+  describe '#as_json' do
+    subject { entity.as_json }
+
+    let(:storage_move) { build(:project_repository_storage_move, :scheduled, destination_storage_name: 'test_second_storage') }
+    let(:entity) { described_class.new(storage_move) }
+
+    it 'includes basic fields' do
+      is_expected.to include(
+        state: 'scheduled',
+        source_storage_name: 'default',
+        destination_storage_name: 'test_second_storage',
+        project: a_kind_of(Hash)
+      )
+    end
+  end
+end